Exim stopped sending emails for some reason

[webbasica]

I have some clients that insist on using forwarders. For them, I create a few forward addresses that forward to their Gmail accounts. And for sending, I create a generic email account that they all use as their smtp user on Gmail.
This setup has been working fine for many years.

This week, they started getting bounces in Gmail with a 550 error. If I check on the Exim rejectlog I can confirm the same error message:

2025-07-25 14:54:30 H=mail-ot1-f49.google.com [209.xx.xxx.xx] X=TLS1.3:TLS_AES_256_GCM_SHA384:256 CV=no rejected MAIL <[email protected]>: Account [email protected] can not send emails from [email protected].

I've trying to troubleshoot the issue, but I'm not a versed in the exim gospel. I've tried restarting Exim, then rebuilding Exim with Custombuild. Tried renewing certificates, checked the local server mail setting. Everything seems alright, and more importantly, nothing has really changed in the last week.

Please help!

 

[Richard G]

This week, they started getting bounces in Gmail with a 550 error. If I check on the Exim rejectlog I can confirm the same error message:

This is the issue caused by the Exim update and change talked about in this thread (click).

This would fix it (do this as root in SSH):

sed -i '/^AUTH_BLOCK_SENDER_SPOOFING /d' /etc/exim.variables.conf.custom
echo 'AUTH_BLOCK_SENDER_SPOOFING = no' >> /etc/exim.variables.conf.custom
da build exim_conf

 

[webbasica]

Thanks, I came directly to this sub-forum to check exactly this. Didn't occur to me to check the general update thread. Fix applied and everything works now.
THANKS!