I have a very annoying issue

Hello, I have a cPanel / whm server and i've got an issue with emails like cpanel@serverhostname.domain.tld sometimes it works for weeks and then out of nowhere i get those "Mail Delivery System errors" it says


550-Verification failed for  550-Unrouteable

address 550 Invalid sender  (in reply to MAIL
FROM command)

I use exim but i do have MailScanner and configserver MSFE installed.My host requires me to configure exim to send mail via a smarthost things i have checked

/etc/aliases contains the "real" root email this is just my personal email address assigned to me by my isp
/etc/localdomains contains the server hostname hostname.domain.tld
/etc/hosts contains main_ip_here hostname.domain.tld hostname
whm -> Edit system mail preferences cpanel = root nobody => root => root => the address from step1 here

the error itself is pretty logic it complains that root@hostname.domain.tld doesn't exist and that is pretty obvious but what the heck can i do about that ?????? also why does it work for days and than suddenly starts complaiing it drives me insane .....:rolleyes: i don't know anymore.

cPRex Jurassic Moderator

April 05, 2021 20:09

Hey there! Intermittent issues, with anything, are just the worst, aren't they? It would help to break it down and see if the error is coming from Exim or a remote host. The mail headers would be a good way for you to determine where the bounce comes from, although posting them here could reveal sensitive information. You might want to make a ticket for this one to avoid unnecessary back and forth.

rscalover

April 05, 2021 20:20

Hello, The errors are coming from the smarthost my host requires me to use or i can't send mail at all it is a kind of antispam thing .It's good they fight spam but a "thing" that sometimes works for days and then starts complaining isn't a good thing so i think it's safe to say exim is innocent i'll have a look at that headers and complain to my host .

April 05, 2021 20:21

Thanks for that update - if it's the smarthost itself, I also think reaching out to the host would be best since there won't be much on the cPanel side of things you can do adjust that.

I have a very annoying issue

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