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

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450All 450 codes →

smtp;450 4.2.0 <example@comcast.net> - Recipient temporarily unavailable

Low severity

452All 452 codes →

smtp;452 4.1.1 <example@comcast.net> too many recent messages; Try again later

Low severity

smtp;452 4.1.1 <example@comcast.net> user over quota

Low severity

550All 550 codes →

smtp;550 5.1.1 Not our Customer

Low severity

smtp;550 5.1.1 <example@comcast.net> recipient mailbox unallocated

smtp;550 5.2.0 Message rejected due to DMARC. Please see http://postmaster.comcast.net/smtp-error-codes.php#DM000001

High severity

smtp;550 5.2.0 <example@comcast.net> - Recipient unavailable

552All 552 codes →

smtp;552 5.1.1 <example@comcast.net> recipient rejected - extended quota violation

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

554 xx.comcast.net comcast x.xx.xx.xx Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000

Low severity

Other email providers

Built with

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