Hello, Having a strange issue with a server. Multiple times a day I get the following errors in mail.log:
451 4.3.5 Server configuration error; from=<r...@server.domain.tld> to=<root@localhost> proto=ESMTP helo=<server.domain.tld> I also get the following email in my admin mailbox: From: Mail Delivery System <mailer-dae...@server.domain.tld> Subject: Postfix SMTP server: errors from localhost[::1] To: postmas...@domain.tld Transcript of session follows. Out: 220 server.domain.tld In: ehlo server.domain.tld Out: 250- server.domain.tld Out: 250-PIPELINING Out: 250-SIZE 52428800 Out: 250-VRFY Out: 250-ETRN Out: 250-STARTTLS Out: 250-ENHANCEDSTATUSCODES Out: 250-8BITMIME Out: 250 DSN In: mail FROM:<root@ server.domain.tld > size=527 Out: 250 2.1.0 Ok In: rcpt TO:<root@localhost> Out: 451 4.3.5 Server configuration error In: rset Out: 250 2.0.0 Ok Session aborted, reason: lost connection For other details, see the local mail logfile So, it looks like some process is trying to send email from r...@server.domain.tld to root@localhost but I don't know what process it is or how to make it stop. It doesn't seem to affect the server otherwise. Other email flows in and out as normal except for these errors. I would appreciate some insight on where to look to get this resolved. Thanks
