It looks like an error may have been introduced during the editing of the "Use Postfix" article. I think the values used in password_maps file and the main.cf file need to match. Otherwise "WantAuthError" shows up in the logs: Aug 03 12:12:57 eb2027-01.cs.siue.edu postfix/smtp[8960]: 11DFB19523: to=< gregory.lee.bartholomew@xxxxxxxxx>, relay=smtp.gmail.com[74.125.69.109]:587, delay=0.39, delays=0.03/0.04/0.3/0.02, dsn=5.5.1, status=bounced (host smtp.gmail.com[74.125.69.109] said: 530-5.5.1 Authentication Required. Learn more at 530 5.5.1 https://support.google.com/mail/?p=WantAuthError f17sm75891337ioc.2 - gsmtp (in reply to MAIL FROM command)) I had used "[smtp.gmail.com]:587" in both places because smtp.gmail.com is an SMTP server, not a domain name against which an MX query should be run. >From the man page: $ man postconf.5 | grep -A 19 ^relayhost relayhost (default: empty) The next-hop destination of non-local mail; overrides non-local domains in recipient addresses. This information is overruled with relay_transport, sender_dependent_default_transport_maps, default_transport, sender_dependent_relayhost_maps and with the transport(5) table. On an intranet, specify the organizational domain name. If your internal DNS uses no MX records, specify the name of the intranet gate‐ way host instead. In the case of SMTP, specify a domain name, hostname, hostname:port, [hostname]:port, [hostaddress] or [hostaddress]:port. The form [hostname] turns off MX lookups. If you're connected via UUCP, see the UUCP_README file for useful information. Examples: relayhost = $mydomain relayhost = [gateway.example.com] relayhost = uucphost relayhost = [an.ip.add.ress] Also, the Wikipedia page on MX records points out some limitations with the MX protocol: "The MX mechanism does not grant the ability to provide mail service on alternative port numbers <https://en.wikipedia.org/wiki/Port_number>, nor does it provide the ability to distribute mail delivery across a set of unequal-priority mail servers by assigning a weighting value to each one." ( https://en.wikipedia.org/wiki/MX_record) So, I think "[smtp.gmail.com]:587" is the proper value. I think other/newer tricks are used to load balance the smtp.gmail.com DNS name and route traffic to the nearest/best server and MX lookups should be avoided in this case. I could be wrong though. I'm not an expert in this field. gb _______________________________________________ Fedora Magazine mailing list -- magazine@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to magazine-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/magazine@xxxxxxxxxxxxxxxxxxxxxxx
