Re: Sendmail auth mechanisms missing after upgrade to Fedora 37

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On Fri, 18 Nov 2022 08:58:02 +0100 (CET)
Scott van Looy via users <users@xxxxxxxxxxxxxxxxxxxxxxx> wrote:

> Hi,
> 
> Having upgraded to the new Fedora 37, I cannot now send mail via
> sendmail remotely using auth.
> 
> Looking at /var/log/maillog, when I try and connect to send an email
> I get:
> 
> "AUTH warning: no mechanisms”
> 
> Looking at the application log I can see:
> 
> 250-<serverdomain> Hello <localdomain>, pleased to meet you
> 250-ENHANCEDSTATUSCODES
> 250-PIPELINING
> 250-8BITMIME
> 250-SIZE
> 250-DSN
> 250-DELIVERBY
> 250 HELP
> 
> So it does indeed look like there are no auth mechanisms present
> 
> I haven’t changed my config, it was working before the upgrade and
> the only thing I’ve been able to find online that vaguely looks like
> it might be the same issue is this:
> 
> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263287
> 
> sendmail.mc has:
> 
> define(`confAUTH_OPTIONS', `A p y’)dnl
> TRUST_AUTH_MECH(`LOGIN PLAIN')dnl
> define(`confAUTH_MECHANISMS', `LOGIN PLAIN’)dnl
> 
> Which all looks correct to me. I’m at a bit of a loss. Does anyone
> have any suggestions as to what might be the issue/what I might be
> able to do?

I recall that some of the system allowed security algorithms were
removed as defaults. You could try 
update-crypto-policies --set LEGACY
to see if that helps.  If it doesn't, you can use
update-crypto-policies --set DEFAULT
to return to the more secure policies.

More information here, about how to selectively enable only the legacy
policies you need, if that is the issue
https://www.redhat.com/en/blog/legacy-cryptography-fedora-36-and-red-hat-enterprise-linux-9
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