For documentation purposes,
Test with an IP address should not send SNI per the patch,
so it should fail with the certificate verification error:
$ mailutil check {imap.gmail.com:993/imap/ssl}INBOX
{cb-in-f108.1e100.net/imap} username:
$ host imap.gmail.com | grep -m1 address
gmail-imap.l.google.com has address 64.233.186.108
$ mailutil check {64.233.186.108:993/imap/ssl}INBOX
Certificate failure for 64.233.186.108: self signed certificate: /OU=No SNI
provided; please fix your client./CN=invalid2.invalid
Certificate failure for 64.233.186.108: self signed certificate: /OU=No SNI
provided; please fix your client./CN=invalid2.invalid
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https://bugs.launchpad.net/bugs/1834340
Title:
Regression for GMail after libssl upgrade with TLSv1.3
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