Comcast
Comcast (also known as "Xfinity") is an internet service provider that also provides email addresses to its customers, headquartered in Pennsylvania. Former customers can still have access to their comcast.net address if they've logged in in the past 90 days, but that also means many of these addresses become inactive over time.
Domain
- comcast.net
Documentation
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450All 450 codes →
452All 452 codes →
550All 550 codes →
552All 552 codes →
554All 554 codes →
host xx.comcast.net [x.xx.xx.xx] SMTP error from remote mail server after initial connection: 554 xx.comcast.net comcast x.xx.xx.xx Comcast requires that all mail servers must have a PTR record with a valid Reverse DNS entry. Currently your mail server does not fill that requirement. For more information, refer to: http://postmaster.comcast.net/smtp-error-codes.php#554
Low severity