Again the same trouble, a gmail account sent an email to alpha with copy to beta, beta received the email but not alpha.
mail.err shows server imapd: Maximum connection limit reached for ::ffff:83.61.12.28
Lots of warnings:
postfix/smtpd[29622]: warning: 204.27.99.59.list.dsbl.org: RBL lookup error: Host or domain name not found. Name service error for name=204.27.99.59.list.dsbl.org type=A: Host not found, try again
or
postfix/smtpd[22562]: warning: 65.162.18.123.list.dsbl.org: RBL lookup error: Host or domain name not found. Name service error for name=65.162.18.123.list.dsbl.org type=A: Host not found, try again
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