I have a problem with sending messages to one domain.
While doing this, message is bounced with an error:
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Jan 24 10:19:16 smtp postfix/smtp[27760]: 6120319A03B0: to=<REDACTED@REDACTED.com>, relay=REDACTED.com[IP_ADDRESS_HERE]:25, delay=0.23, delays=0/0/0.22/0, dsn=5.0.0, status=bounced (host REDACTED.com[IP_ADDRESS_HERE] refused to talk to me: 530 #5.7.0 Must issue a STARTTLS command first)
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zmprov gcf zimbraMtaTlsSecurityLevel
zimbraMtaTlsSecurityLevel: may
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zmprov gs `zmhostname` zimbraMtaSmtpTlsSecurityLevel
zimbraMtaSmtpTlsSecurityLevel: may
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TLS is required, but was not offered by host 127.0.0.1[127.0.0.1]
Did you have that problem? Do you have any idea how to resolve that?