Public bug reported:
Very recently, my (unchanged for years) bionic exim4 flow ( outgoing
SMTP -> smtp.canonical.com ) abruptly stopped working, with exim4 log as
follows:
SMTP<< 220 smtp-relay-canonical-1.canonical.com ESMTP Postfix (Ubuntu)
SMTP>> EHLO myhostname
SMTP<< 250-smtp-relay-canonical-1.canonical.com
250-PIPELINING
250-SIZE 61440000
250-VRFY
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250-DSN
250-SMTPUTF8
250 CHUNKING
SMTP>> STARTTLS
SMTP<< 220 2.0.0 Ready to start TLS
SMTP>> EHLO myhostname
H=smtp.canonical.com [185.125.188.121] TLS error on connection (recv):
Resource temporarily unavailable, try again.
SMTP(close)>>
H=smtp.canonical.com [185.125.188.121]: Remote host closed connection in
response to EHLO myhostname
This appears to be a manifestation of this exim4 bug which was fixed in exim4
(4.92): https://bugs.exim.org/show_bug.cgi?id=2359
See also: https://www.mail-archive.com/exim-users@exim.org/msg53121.html
I found and installed a PPA version of exim4 (4.94) for bionic, which
did fix the problem for me.
I believe that all Ubuntu versions which supply exim4 < 4.92 {Bionic,
Xenial, Trusty} are affected by this bug, which leaves exim4
mysteriously broken when the server side happens to move to TLS 1.3.
I suggest updating exim4 on the affected Ubuntu versions.
** Affects: exim4 (Ubuntu)
Importance: High
Status: New
** Affects: exim4 (Ubuntu Trusty)
Importance: Undecided
Status: New
** Affects: exim4 (Ubuntu Xenial)
Importance: Undecided
Status: New
** Affects: exim4 (Ubuntu Bionic)
Importance: Undecided
Status: New
** Also affects: exim4 (Ubuntu Trusty)
Importance: Undecided
Status: New
** Also affects: exim4 (Ubuntu Bionic)
Importance: Undecided
Status: New
** Also affects: exim4 (Ubuntu Xenial)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1971489
Title:
exim4 GnuTLS breakage with outgoing TLS 1.3 "Resource temporarily
unavailable"
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