Hi Gabriele Can you check the spool directory where the mail is queued. For sendmail, i recall it was /var/spool/mqueue.
Also check message_size_limit and mailbox_size_limit in main.cf Regards Ahsan On Fri, May 29, 2020 at 6:14 PM Gabriele Bulfon <gbul...@sonicle.com> wrote: > Hello, > > I have a system running for some years, recently started to send "452 > 4.3.1 Insufficient system storage" errors randomly. > Sometimes 2-3 during the night, sometimes many more (20-30). > Postfix is running under an illumos zone, over a zfs data pool with more > than 1TB of free space. > Size of emails with error is small enough to fit max message size. > The error email shows this: > > Transcript of session follows. > > Out: 220 servername ESMTP Postfix > In: EHLO mail1.ferrari.it > Out: 250-servername > Out: 250-SIZE 50000000 > Out: 250-VRFY > Out: 250-ETRN > Out: 250-STARTTLS > Out: 250-AUTH PLAIN > Out: 250-AUTH=PLAIN > Out: 250-ENHANCEDSTATUSCODES > Out: 250-8BITMIME > Out: 250 DSN > In: STARTTLS > Out: 220 2.0.0 Ready to start TLS > In: EHLO sendingservername > Out: 250-servername > Out: 250-SIZE 50000000 > Out: 250-VRFY > Out: 250-ETRN > Out: 250-AUTH PLAIN > Out: 250-AUTH=PLAIN > Out: 250-ENHANCEDSTATUSCODES > Out: 250-8BITMIME > Out: 250 DSN > In: MAIL FROM:<sender> SIZE=85683 > Out: 452 4.3.1 Insufficient system storage > In: QUIT > Out: 221 2.0.0 Bye > > Never happened before. > Any idea what's happening? > > Thanks! > Gabriele > > > > *Sonicle S.r.l. *: http://www.sonicle.com > *Music: *http://www.gabrielebulfon.com > *Quantum Mechanics : *http://www.cdbaby.com/cd/gabrielebulfon >
