Tobias,
No starttls definitely works for me at least: MailCow with
postfix-mta-sts-resolver.
______________________________________________
This is the mail system at host mail.virtcolo.com.
I'm sorry to have to inform you that your message could not be delivered to one
or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can delete your own text
from the attached returned message.
The mail system
<measurem...@mail-mtasts-n-plain.measurement.email-security-scans.org>: TLS is
required, but was not offered by host
plaintext.measurement.email-security-scans.org[195.191.197.83]
______________________________________________
Sincerely,
Eric Tykwinski
TrueNet, Inc.
P: 610-429-8300
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