Re: Sendmail on FreeBSD 14, gmail problem

On 4/15/24 11:45, bp@www.zefox.net wrote:

I've got a FreeBSD 14 host running sendmail from packages that works perfectly otherwise but can't be persuaded to communicate with gmail:

I think that Gmail, or rather Gmail's new (February this year) requirements are the problem.

(reason: 550-5.7.26 This mail has been blocked because the sender is unauthenticated.)

Gmail is now requiring authentication to accept email.  That can take the form of SPF and / or DKIM for the sending domain.
I don't see TXT records used by SPF for zefox.net nor www.zefox.net.  So you would need to use DKIM.  I don't see any DKIM (milter) configuration in the snippet of freebsd.mc.
As such I would expect that Gmail would reject messages from <anything>@zefox.net or <anything>@www.zefox.net
I'll bet you dollars to doughnuts that there's nothing technically wrong with your Sendmail configuration.  Save for the lack of DKIM or supporting SPF records.
--
Grant. . . .