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It looks like PNC Paid is using #ProofPoint servers for its outbound email delivery. I know from personal experience that ProofPoint absolutely sucks at email delivery, so perhaps that's part of the problem.

Note that ProofPoint, A SECURE EMAIL COMPANY, runs mail servers that are incapable of negotiating non-deprecated TLS ciphers:

STARTTLS=server, error: accept failed=-1, reason=no shared cipher, SSL_error=1, errno=0, retry=-1, relay=mx0a-000ade01.pphosted.com [205.220.165.107]

#infosec