This may be from Marketo or something? Whois shows Adobe with an ab...@marketo.com contact address.
Oct 25 10:10:50 hyperion postfix/smtpd[1588023]: connect from r117.mail.aircanada.com[172.82.216.117] Oct 25 10:10:51 hyperion postfix/smtpd[1588023]: SSL_accept error from r117.mail.aircanada.com[172.82.216.117]: -1 Oct 25 10:10:51 hyperion postfix/smtpd[1588023]: warning: TLS library problem: error:14094415:SSL routines:ssl3_read_bytes:sslv3 alert certificate expired:ssl/record/rec_layer_s3.c:1543:SSL alert number 45: Oct 25 10:10:51 hyperion postfix/smtpd[1588023]: lost connection after STARTTLS from r117.mail.aircanada.com[172.82.216.117] Oct 25 10:10:51 hyperion postfix/smtpd[1588023]: disconnect from r117.mail.aircanada.com[172.82.216.117] ehlo=1 starttls=0/1 commands=1/2 --- This is almost certainly caused by the expiration of the DST Root CA X3 certificate: https://letsencrypt.org/docs/dst-root-ca-x3-expiration-september-2021/ If anyone has a contact at this sender please suggest that they install a trust certificate for Let's Encrypt's current root certificate (and maybe any other security updates that they've missed since 2017). Thanks.
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