Hello,
here is the smtpd process strace when I try to send a mail, I don't know if this will help but here it is :
( I put in green what seems to be important )
root@smtptest:~# strace -ff -v -s 300 -p 45600
strace: Process 45600 attached
alarm(0) = 5993
flock(9, LOCK_EX) = 0
alarm(6000) = 0
epoll_wait(11, [{EPOLLIN, {u32=6, u64=6}}], 100, 88000) = 1
fstat(14, {st_dev=makedev(0x8, 0x1), st_ino=391991, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=24, st_size=12288, st_atime=1632127196 /* 2021-09-20T10:39:56.891344035+0200 */, st_atime_nsec=891344035, st_mtime=1630655169 /* 2021-09-03T09:46:09.587829419+0200 */, st_mtime_nsec=587829419, st_ctime=1630655169 /* 2021-09-03T09:46:09.587829419+0200 */, st_ctime_nsec=587829419}) = 0
accept(6, {sa_family=AF_INET, sin_port=htons(59366), sin_addr=inet_addr("192.168.128.253")}, [128->16]) = 10
setsockopt(10, SOL_SOCKET, SO_KEEPALIVE, [1], 4) = 0
flock(9, LOCK_UN) = 0
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: connection established", 75, MSG_NOSIGNAL, NULL, 0) = 75
fcntl(10, F_GETFL) = 0x2 (flags O_RDWR)
fcntl(10, F_SETFL, O_RDWR) = 0
fcntl(10, F_GETFD) = 0
fcntl(10, F_SETFD, FD_CLOEXEC) = 0
write(5, " \262\0\0\6\0\0\0\0\0\0\0", 12) = 12
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: master_notify: status 0", 76, MSG_NOSIGNAL, NULL, 0) = 76
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: name_mask: resource", 72, MSG_NOSIGNAL, NULL, 0) = 72
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: name_mask: software", 72, MSG_NOSIGNAL, NULL, 0) = 72
getpeername(10, {sa_family=AF_INET, sin_port=htons(59366), sin_addr=inet_addr("192.168.128.253")}, [128->16]) = 0
getsockname(10, {sa_family=AF_INET, sin_port=htons(587), sin_addr=inet_addr("192.168.128.80")}, [128->16]) = 0
geteuid() = 106
getuid() = 106
stat("/etc/resolv.conf", {st_dev=makedev(0x8, 0x1), st_ino=391028, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=8, st_size=79, st_atime=1632127196 /* 2021-09-20T10:39:56.899344027+0200 */, st_atime_nsec=899344027, st_mtime=1630654618 /* 2021-09-03T09:36:58.012863358+0200 */, st_mtime_nsec=12863358, st_ctime=1630654618 /* 2021-09-03T09:36:58.012863358+0200 */, st_ctime_nsec=12863358}) = 0
openat(AT_FDCWD, "/etc/hosts", O_RDONLY|O_CLOEXEC) = 12
lseek(12, 0, SEEK_CUR) = 0
fstat(12, {st_dev=makedev(0x8, 0x1), st_ino=391191, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=8, st_size=283, st_atime=1632119772 /* 2021-09-20T08:36:12.790633935+0200 */, st_atime_nsec=790633935, st_mtime=1631693166 /* 2021-09-15T10:06:06.673081387+0200 */, st_mtime_nsec=673081387, st_ctime=1631693166 /* 2021-09-15T10:06:06.681081379+0200 */, st_ctime_nsec=681081379}) = 0
read(12, "127.0.0.1\tlocalhost\n172.20.2.2 S4.ari.int S4\n172.20.2.3 S4bis.ari.int S4bis\n192.168.128.80\tsmtptest.domain.fr\tsmtptest\n\n# The following lines are desirable for IPv6 capable hosts\n::1 localhost ip6-localhost ip6-loopback\nff02::1 ip6-allnodes\nff02::2 ip6-allrouters\n", 4096) = 283
lseek(12, 0, SEEK_CUR) = 283
read(12, "", 4096) = 0
close(12) = 0
socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, IPPROTO_IP) = 12
setsockopt(12, SOL_IP, IP_RECVERR, [1], 4) = 0
connect(12, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("1.1.1.1")}, 16) = 0
poll([{fd=12, events=POLLOUT}], 1, 0) = 1 ([{fd=12, revents=POLLOUT}])
sendto(12, ")Y\1\0\0\1\0\0\0\0\0\0\003253\003128\003168\003192\7in-addr\4arpa\0\0\f\0\1", 46, MSG_NOSIGNAL, NULL, 0) = 46
poll([{fd=12, events=POLLIN}], 1, 5000) = 1 ([{fd=12, revents=POLLIN}])
ioctl(12, FIONREAD, [46]) = 0
recvfrom(12, ")Y\201\203\0\1\0\0\0\0\0\0\003253\003128\003168\003192\7in-addr\4arpa\0\0\f\0\1", 1024, 0, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("1.1.1.1")}, [28->16]) = 46
close(12) = 0
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: connect from unknown[192.168.128.253]", 90, MSG_NOSIGNAL, NULL, 0) = 90
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: match_list_match: unknown: no match", 88, MSG_NOSIGNAL, NULL, 0) = 88
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: match_list_match: 192.168.128.253: no match", 96, MSG_NOSIGNAL, NULL, 0) = 96
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: match_list_match: unknown: no match", 88, MSG_NOSIGNAL, NULL, 0) = 88
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: match_list_match: 192.168.128.253: no match", 96, MSG_NOSIGNAL, NULL, 0) = 96
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: smtp_stream_setup: maxtime=300 enable_deadline=0", 101, MSG_NOSIGNAL, NULL, 0) = 101
rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: match_hostname: smtpd_client_event_limit_exceptions: unknown ~? 127.0.0.0/8", 128, MSG_NOSIGNAL, NULL, 0) = 128
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: match_hostaddr: smtpd_client_event_limit_exceptions: 192.168.128.253 ~? 127.0.0.0/8", 136, MSG_NOSIGNAL, NULL, 0) = 136
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: match_hostname: smtpd_client_event_limit_exceptions: unknown ~? 192.168.128.0/24", 133, MSG_NOSIGNAL, NULL, 0) = 133
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: match_hostaddr: smtpd_client_event_limit_exceptions: 192.168.128.253 ~? 192.168.128.0/24", 141, MSG_NOSIGNAL, NULL, 0) = 141
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 220 smtptest.domain.fr ESMTP Postfix (Debian/GNU)", 135, MSG_NOSIGNAL, NULL, 0) = 135
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: xsasl_cyrus_server_create: SASL service=smtp, realm=(null)", 111, MSG_NOSIGNAL, NULL, 0) = 111
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: name_mask: noanonymous", 75, MSG_NOSIGNAL, NULL, 0) = 75
poll([{fd=10, events=POLLOUT}], 1, 300000) = 1 ([{fd=10, revents=POLLOUT}])
write(10, "220 smtptest.domain.fr ESMTP Postfix (Debian/GNU)\r\n", 56) = 56
poll([{fd=10, events=POLLIN}], 1, 300000) = 1 ([{fd=10, revents=POLLIN}])
read(10, "EHLO [172.20.4.195]\r\n", 4096) = 21
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: < unknown[192.168.128.253]: EHLO [172.20.4.195]", 100, MSG_NOSIGNAL, NULL, 0) = 100
ioctl(10, FIONREAD, [0]) = 0
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: match_list_match: unknown: no match", 88, MSG_NOSIGNAL, NULL, 0) = 88
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: match_list_match: 192.168.128.253: no match", 96, MSG_NOSIGNAL, NULL, 0) = 96
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 250-smtptest.domain.fr", 108, MSG_NOSIGNAL, NULL, 0) = 108
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 250-PIPELINING", 95, MSG_NOSIGNAL, NULL, 0) = 95
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 250-SIZE 10240000", 98, MSG_NOSIGNAL, NULL, 0) = 98
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 250-VRFY", 89, MSG_NOSIGNAL, NULL, 0) = 89
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 250-ETRN", 89, MSG_NOSIGNAL, NULL, 0) = 89
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 250-STARTTLS", 93, MSG_NOSIGNAL, NULL, 0) = 93
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 250-AUTH GSSAPI", 96, MSG_NOSIGNAL, NULL, 0) = 96
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 250-AUTH=GSSAPI", 96, MSG_NOSIGNAL, NULL, 0) = 96
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 250-ENHANCEDSTATUSCODES", 104, MSG_NOSIGNAL, NULL, 0) = 104
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 250-8BITMIME", 93, MSG_NOSIGNAL, NULL, 0) = 93
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 250-DSN", 88, MSG_NOSIGNAL, NULL, 0) = 88
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 250-SMTPUTF8", 93, MSG_NOSIGNAL, NULL, 0) = 93
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 250 CHUNKING", 93, MSG_NOSIGNAL, NULL, 0) = 93
poll([{fd=10, events=POLLOUT}], 1, 300000) = 1 ([{fd=10, revents=POLLOUT}])
write(10, "250-smtptest.domain.fr\r\n250-PIPELINING\r\n250-SIZE 10240000\r\n250-VRFY\r\n250-ETRN\r\n250-STARTTLS\r\n250-AUTH GSSAPI\r\n250-AUTH=GSSAPI\r\n250-ENHANCEDSTATUSCODES\r\n250-8BITMIME\r\n250-DSN\r\n250-SMTPUTF8\r\n250 CHUNKING\r\n", 208) = 208
poll([{fd=10, events=POLLIN}], 1, 300000) = 1 ([{fd=10, revents=POLLIN}])
read(10, "STARTTLS\r\n", 4096) = 10
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: < unknown[192.168.128.253]: STARTTLS", 89, MSG_NOSIGNAL, NULL, 0) = 89
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 220 2.0.0 Ready to start TLS", 109, MSG_NOSIGNAL, NULL, 0) = 109
poll([{fd=10, events=POLLOUT}], 1, 300000) = 1 ([{fd=10, revents=POLLOUT}])
write(10, "220 2.0.0 Ready to start TLS\r\n", 30) = 30
socket(AF_UNIX, SOCK_STREAM, 0) = 12
fcntl(12, F_GETFL) = 0x2 (flags O_RDWR)
fcntl(12, F_SETFL, O_RDWR|O_NONBLOCK) = 0
connect(12, {sa_family=AF_UNIX, sun_path="private/tlsmgr"}, 110) = 0
fcntl(12, F_GETFL) = 0x802 (flags O_RDWR|O_NONBLOCK)
fcntl(12, F_SETFL, O_RDWR) = 0
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: auto_clnt_open: connected to private/tlsmgr", 96, MSG_NOSIGNAL, NULL, 0) = 96
fcntl(12, F_GETFD) = 0
fcntl(12, F_SETFD, FD_CLOEXEC) = 0
epoll_ctl(11, EPOLL_CTL_ADD, 12, {EPOLLIN, {u32=12, u64=12}}) = 0
poll([{fd=12, events=POLLIN}], 1, 0) = 0 (Timeout)
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: send attr request = seed", 77, MSG_NOSIGNAL, NULL, 0) = 77
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: send attr size = 32", 72, MSG_NOSIGNAL, NULL, 0) = 72
poll([{fd=12, events=POLLOUT}], 1, 3600000) = 1 ([{fd=12, revents=POLLOUT}])
write(12, "request\0seed\0size\00032\0\0", 22) = 22
poll([{fd=12, events=POLLIN}], 1, 3600000) = 1 ([{fd=12, revents=POLLIN}])
read(12, "status\0000\0seed\0+Ri647QWTh0+hRtHgsufqxmkO/UCgKdqg75OsZVpMh0=\0\0", 4096) = 60
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: private/tlsmgr: wanted attribute: status", 93, MSG_NOSIGNAL, NULL, 0) = 93
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: input attribute name: status", 81, MSG_NOSIGNAL, NULL, 0) = 81
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: input attribute value: 0", 77, MSG_NOSIGNAL, NULL, 0) = 77
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: private/tlsmgr: wanted attribute: seed", 91, MSG_NOSIGNAL, NULL, 0) = 91
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: input attribute name: seed", 79, MSG_NOSIGNAL, NULL, 0) = 79
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: input attribute value: +Ri647QWTh0+hRtHgsufqxmkO/UCgKdqg75OsZVpMh0=", 120, MSG_NOSIGNAL, NULL, 0) = 120
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: private/tlsmgr: wanted attribute: (list terminator)", 104, MSG_NOSIGNAL, NULL, 0) = 104
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: input attribute name: (end)", 80, MSG_NOSIGNAL, NULL, 0) = 80
fcntl(10, F_GETFL) = 0x2 (flags O_RDWR)
fcntl(10, F_SETFL, O_RDWR|O_NONBLOCK) = 0
read(10, 0x55945e06d5c3, 5) = -1 EAGAIN (Ressource temporairement non disponible)
poll([{fd=10, events=POLLIN}], 1, 300000) = 1 ([{fd=10, revents=POLLIN}])
read(10, "\26\3\1\2*", 5) = 5
read(10, "\1\0\2&\3\3\32\24g\3<\231[\32\254\37\31\370\301c]\266\20\234\264\345xu\333\271A\7i\262\211\266\nM t\210\357\362.\307\"<\350\7 \30\331<\231O_\373\257\224\f\201\\\25V]\306x\1\267\301\16\0$\23\1\23\3\23\2\300+\300/\314\251\314\250\300,\3000\300\n\300\t\300\23\300\24\0\234\0\235\0/\0005\0\n\1\0\1\271\0\27\0\0\377\1\0\1\0\0\n\0\16\0\f\0\35\0\27\0\30\0\31\1\0\1\1\0\v\0\2\1\0\0\5\0\5\1\0\0\0\0\0003\0k\0i\0\35\0 H\272\25\202\226Fv\226\225\260ic\255\342\223\237\224\334d\325\360\0277$ei#\272\202&\230I\0\27\0A\4\235;(L*@/\261\301Z\226\fr\r(\220\263\37\33tM`\232\306\r\242\337\300\20\266\351,F\242\236\362\36ze\r\252~\237\232\326\275\205\307I\325\204\267D\371\252\224\376\306\307\211c\202\300\334\0+\0\5\4\3\4\3\3\0\r\0\30\0\26\4\3\5\3\6\3\10\4\10\5\10\6\4\1\5\1\6\1\2"..., 554) = 554
getpid() = 45600
getpid() = 45600
getpid() = 45600
getpid() = 45600
getpid() = 45600
getpid() = 45600
write(10, "\26\3\3\0\200\2\0\0|\3\3\226dP\346\306V\350l\r\264Q(\37\271\260\211{#\320\213\227\210\245\214\21f\2453\0204\16\265 t\210\357\362.\307\"<\350\7 \30\331<\231O_\373\257\224\f\201\\\25V]\306x\1\267\301\16\23\1\0\0004\0+\0\2\3\4\0003\0$\0\35\0 \222\23\255 \365D\2;r\325hN\3408\25\273\2031\317 \201\v;\343\20\342\3\360\342\276\366\30\0)\0\2\0\0\24\3\3\0\1\1\27\3\3\0\27\375G\2423&\266k$\334\21\5.\253\226\337qwT\233-\334\364\231\27\3\3\0005\235\25O4\365c@\252o O]\0054n\332\204D\t\305}\2365\255 [<\253R\227\4P\374Q\3478\331\303F\304yj\r[\254+\3329\0333\274i\221", 225) = 225
read(10, 0x55945e06d5c3, 5) = -1 EAGAIN (Ressource temporairement non disponible)
poll([{fd=10, events=POLLIN}], 1, 300000) = 1 ([{fd=10, revents=POLLIN}])
read(10, "\24\3\3\0\1", 5) = 5
read(10, "\1", 1) = 1
read(10, "\27\3\3\0005", 5) = 5
read(10, "\326\347\334\271f\6\246\317u\230\370&\24Q\357wO4y\3465}\377\254\t\216\313\2677\304j\224Q>\361\372\1\307#';0\213\235~\310\214l\262\23\266\377\275", 53) = 53
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: xsasl_cyrus_server_create: SASL service=smtp, realm=(null)", 111, MSG_NOSIGNAL, NULL, 0) = 111
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: name_mask: noanonymous", 75, MSG_NOSIGNAL, NULL, 0) = 75
read(10, 0x55945e06d5c3, 5) = -1 EAGAIN (Ressource temporairement non disponible)
poll([{fd=10, events=POLLIN}], 1, 300000) = 1 ([{fd=10, revents=POLLIN}])
read(10, "\27\3\3\0&", 5) = 5
read(10, "\303\320B\t\240\300\212\276\357\373m\24\347}|\251\206\v\10a\263\245\221\3\340L\351z.\n\344\212\31\333\237\21\2501", 38) = 38
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: < unknown[192.168.128.253]: EHLO [172.20.4.195]", 100, MSG_NOSIGNAL, NULL, 0) = 100
ioctl(10, FIONREAD, [0]) = 0
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: match_list_match: unknown: no match", 88, MSG_NOSIGNAL, NULL, 0) = 88
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: match_list_match: 192.168.128.253: no match", 96, MSG_NOSIGNAL, NULL, 0) = 96
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 250-smtptest.domain.fr", 108, MSG_NOSIGNAL, NULL, 0) = 108
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 250-PIPELINING", 95, MSG_NOSIGNAL, NULL, 0) = 95
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 250-SIZE 10240000", 98, MSG_NOSIGNAL, NULL, 0) = 98
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 250-VRFY", 89, MSG_NOSIGNAL, NULL, 0) = 89
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 250-ETRN", 89, MSG_NOSIGNAL, NULL, 0) = 89
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 250-AUTH GSSAPI", 96, MSG_NOSIGNAL, NULL, 0) = 96
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 250-AUTH=GSSAPI", 96, MSG_NOSIGNAL, NULL, 0) = 96
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 250-ENHANCEDSTATUSCODES", 104, MSG_NOSIGNAL, NULL, 0) = 104
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 250-8BITMIME", 93, MSG_NOSIGNAL, NULL, 0) = 93
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 250-DSN", 88, MSG_NOSIGNAL, NULL, 0) = 88
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 250-SMTPUTF8", 93, MSG_NOSIGNAL, NULL, 0) = 93
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 250 CHUNKING", 93, MSG_NOSIGNAL, NULL, 0) = 93
write(10, "\27\3\3\0\323\351\221m\231\4l\0024\356\f!\231\31\316v\254S\211\203\245)X\372\rGBy\3F\326a\35\243\265\0251\325'J\215\333\371\4\33\266\35E\347\v\375\49\210r\fP\204\270B\275\n0\342\35\340\362\374\231\2670\254\255\205\34{\246\256\377\301\3328\253\0332\324\306\327b\347\207\227}-\27J\237\2267\235\241\323u\320\366L\332\257%\316=x\212\236\nqa\320\377\200\243\1r\370\231\224\10\326\312s1\301\325\10\200\320u\10\372\262\240\316S=\362~\321c\275\274\330\324\242\247\351\260{\305\376<+uQC\\\252Y\354L\370\251\f|\206\336\33\201K\366\264\21o\2270Wh\3140\342\3\224\252\211cp\324n\344g`\327\245\322\330\373:Gf\367\343<\312", 216) = 216
read(10, 0x55945e06d5c3, 5) = -1 EAGAIN (Ressource temporairement non disponible)
poll([{fd=10, events=POLLIN}], 1, 300000) = 1 ([{fd=10, revents=POLLIN}])
read(10, "\27\3\3\0\27", 5) = 5
read(10, "j\342\314\367\36\232<\2l\231\201>\232\321\211\5\245\244\34\257<08", 23) = 23
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: < unknown[192.168.128.253]: QUIT", 85, MSG_NOSIGNAL, NULL, 0) = 85
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: > unknown[192.168.128.253]: 221 2.0.0 Bye", 94, MSG_NOSIGNAL, NULL, 0) = 94
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: match_hostname: smtpd_client_event_limit_exceptions: unknown ~? 127.0.0.0/8", 128, MSG_NOSIGNAL, NULL, 0) = 128
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: match_hostaddr: smtpd_client_event_limit_exceptions: 192.168.128.253 ~? 127.0.0.0/8", 136, MSG_NOSIGNAL, NULL, 0) = 136
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: match_hostname: smtpd_client_event_limit_exceptions: unknown ~? 192.168.128.0/24", 133, MSG_NOSIGNAL, NULL, 0) = 133
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: match_hostaddr: smtpd_client_event_limit_exceptions: 192.168.128.253 ~? 192.168.128.0/24", 141, MSG_NOSIGNAL, NULL, 0) = 141
write(10, "\27\3\3\0 A*\204[)\336:\324T\200\317TO\300\342/s\263\353\214\25\343N\355z\202\5\10G \nu", 37) = 37
write(10, "\27\3\3\0\23\210\210\355<\354w\vs\225\261\200UB\177#\353~\215\231", 24) = 24
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: disconnect from unknown[192.168.128.253] ehlo=2 starttls=1 quit=1 commands=4", 129, MSG_NOSIGNAL, NULL, 0) = 129
close(10) = 0
write(5, " \262\0\0\6\0\0\0\1\0\0\0", 12) = 12
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: master_notify: status 1", 76, MSG_NOSIGNAL, NULL, 0) = 76
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:08 postfix/submission/smtpd[45600]: connection closed", 70, MSG_NOSIGNAL, NULL, 0) = 70
alarm(0) = 5986
flock(9, LOCK_EX) = 0
alarm(6000) = 0
epoll_wait(11, [], 100, 5000) = 0
getpid() = 45600
sendto(8, "<22>Sep 20 15:41:13 postfix/submission/smtpd[45600]: auto_clnt_close: disconnect private/tlsmgr stream", 102, MSG_NOSIGNAL, NULL, 0) = 102
epoll_ctl(11, EPOLL_CTL_DEL, 12, 0x7ffe7c1335ac) = 0
close(12) = 0
alarm(0) = 5995
flock(9, LOCK_EX) = 0
alarm(6000) = 0
epoll_wait(11,
Thanks.
