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Getting false positive DNS errors when sending to ATT/SBC?
pubsub.slavino.sk / spam_resource · Friday, 6 August, 2021 - 12:00 edit
Are you running into this error message when sending to users at AT&T/SBCGlobal email domains ?
<(user)@sbcglobal.net>: host al-ip4-mx-vip2.prodigy.net [144.160.235.144] said: 550 5.7.1 Connections not accepted from servers without a valid sender domain.xxx123 Fix reverse DNS for 1.2.3.4 (in reply to MAIL FROM command)