Deliverability to comcast.net
Comcast is a multimedia giant with roots in music, film, television, and, you guessed it, email, and telecommunications. Comcast launched its online communications platform in 2008. Users can access their Comcast.net email and voice services via an integrated hub dubbed Xfinity Connect.
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Sent vs Opens for comcast.net

Date Sent Opens Open Rate
10/1/2022 30,051 5,594 0.0%
9/30/2022 25,346 4,471 0.0%
9/29/2022 33,926 8,129 0.0%
9/28/2022 40,987 8,229 0.0%
9/27/2022 35,671 8,889 0.0%
9/26/2022 39,387 12,129 0.0%
9/25/2022 28,672 9,173 0.0%
9/24/2022 34,718 10,182 0.0%
9/23/2022 37,316 11,069 0.0%
9/22/2022 33,111 10,130 0.0%
9/21/2022 47,332 11,104 0.0%
9/20/2022 38,378 11,213 0.0%
9/19/2022 40,609 9,712 0.0%
9/18/2022 22,464 5,419 0.0%
9/17/2022 30,610 8,914 0.0%
9/16/2022 31,616 8,089 0.0%
9/15/2022 33,499 9,202 0.0%
9/14/2022 37,282 7,143 0.0%
9/13/2022 28,254 7,132 0.0%
9/12/2022 34,415 6,341 0.0%
9/11/2022 17,546 3,662 0.0%
9/10/2022 24,615 4,905 0.0%
9/9/2022 30,517 7,246 0.0%
9/8/2022 37,091 6,582 0.0%
9/7/2022 33,995 7,279 0.0%
9/6/2022 37,121 6,711 0.0%
9/5/2022 23,175 5,662 0.0%
9/4/2022 20,818 5,067 0.0%
9/3/2022 24,939 6,588 0.0%
9/2/2022 25,414 6,512 0.0%

Blocks from comcast.net

No blocks during specified time frame

Bounces from comcast.net

Explanation of bounce codes

Message Count
550 5.1.1 Not our Customer 6,272
550 4.2.0 Not our Customer 809
552 5.1.1 recipient rejected - extended quota violation 163
550 5.2.0 - Recipient unavailable 156
550 5.1.1 recipient unallocated 135
550 5.2.0 Not our Customer 123
Reached max queue time 75
NoMxRecord:0-0 45
450 4.2.0 - Recipient temporarily unavailable 40
452 4.1.1 user over quota 34
452 4.1.0 ... temporary failure 24
535 Incorrect authentication data 19
550 4.2.0 recipient unallocated 13
550 5.1.10 Recipient not found by SMTP address lookup 8
SMTP; 550 5.1.1 Not our Customer 7
550 5.1.0 Invalid sender domain 6
452 4.2.0 ... temporary failure 5
553 sorry, that domain isn't in my list of allowed rcpthosts; no valid cert for gatewaying 3
452 4.2.0 user over quota 3
535 Authentication credentials invalid 3
550 5.7.520 Access denied, Your organization does not allow external forwarding. Please contact your administrator for further assistance. AS 2
550 4.2.0 Invalid sender domain 2
452 5.2.0 ... temporary failure 2
550 5.2.0 recipient unallocated 2
550-5.7.1 Messages missing a valid messageId header are not 550 5.7.1 accepted. - gsmtp 2
SMTP; 554 5.1.0 205.220.165.146 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000 1
550 5.1.1 User unknown; rejecting 1
550 5.1.1 : Recipient address rejected: User unknown 1
550 5.7.1 Message blocked. If this is a false positive, please report this to your hosting service provider. See https://console.mailchannels.net/insights/bounce?auid=interserver&sender=ct%40nextbridgeadvisors.com&txid=73274fd65dfbd50c 1
554 5.2.2 mailbox full; Failed to process message due to a permanent exception with message The process failed to get the correct properties. 0.35250A030000, 1.36674, 1.61250, 1.45378, 1.44866B000000, 1.36674:A1000000, 1.61250, 1.45378, 1.44866, 1.36674, 1.61250, 1.45378, 1.44866, 1.36674, 1.61250, 1.45378, 1.44866, 16.55847:EC000000, 17.43559C6030000000000000000000000000000, 20.52176FEC95160070201F001336, 20.50032FEC958617101030000000, 0.35180, 255.23226F000000, 255.27962, 255.17082:DD040000, 0 1
550 5.7.1 Connection refused - - https://postmaster-earthlink.vadesecure.com/inbound_error_codes/#_403 1
554 5.2.2 mailbox full; Failed to process message due to a permanent exception with message The process failed to get the correct properties. 0.35250, 1.36674, 1.61250, 1.45378, 1.44866B000000, 1.36674:A1000000, 1.61250, 1.45378, 1.44866, 1.36674, 1.61250, 1.45378, 1.44866, 1.36674, 1.61250, 1.45378, 1.44866, 16.55847:EC000000, 17.43559B6030000000000000000000000000000, 20.52176FD4951500F01F03000136, 20.50032FD4958517F01F07000000, 0.35180E265, 255.23226A0000, 255.27962, 255.17082:DD040000, 0.2492 1
552 1 Requested mail action aborted, mailbox not found 1
550-5.1.1 The email account that you tried to reach does not exist. Please try 550-5.1.1 double-checking the recipient's email address for typos or 550-5.1.1 unnecessary spaces. 1
550-5.2.1 The email account that you tried to reach is disabled. 1
554 5.4.14 Hop count exceeded - possible mail loop ATTR34 1
550 No Such User Here" 1
554 5.2.2 mailbox full; Failed to process message due to a permanent exception with message The process failed to get the correct properties. 0.35250:B4030000, 1.36674, 1.61250, 1.45378, 1.44866B000000, 1.36674:A1000000, 1.61250, 1.45378, 1.44866, 1.36674, 1.61250, 1.45378, 1.44866, 1.36674, 1.61250, 1.45378, 1.44866, 16.55847:EC000000, 17.43559C6030000000000000000000000000000, 20.52176F00961300F01F03000136, 20.50032F00968317F01F07000000, 0.35180E265, 255.23226F000000, 255.27962, 255.17082:DD040 1
554 Too many retries 1
550 5.4.6 : Recipient address rejected: Sender Domain Hourly Bounce Limit Exceeded - will not be allowed to send emails till as hourly bounce limit is exceeded. Please refer to this: 1
554 5.2.2 mailbox full; Failed to process message due to a permanent exception with message The process failed to get the correct properties. 0.35250:B4030000, 1.36674, 1.61250, 1.45378, 1.44866B000000, 1.36674:A1000000, 1.61250, 1.45378, 1.44866, 1.36674, 1.61250, 1.45378, 1.44866, 1.36674, 1.61250, 1.45378, 1.44866, 16.55847:EC000000, 17.43559C6030000000000000000000000000000, 20.52176F00961300F01F03000136, 20.50032F00968317F01F07000000, 0.35180E265, 255.23226, 255.27962, 255.17082:DD040000, 0. 1
550 5.1.1 not found 1
550 5.2.0 Message rejected due to DMARC. Please see http://postmaster.comcast.net/smtp-error-codes.php#DM000001 1
SMTP; 550 5.1.1 recipient unallocated 1
535 5.7.8 Error: authentication failed: 1

Methodology

Send and open statistics are updated daily. Bounces and blocks are updated in real-time. Every day, open statistics are updated for the last 14 days. Generally, you'll notice an increase of an open rate for a domain for a day over the course of 14 days, since not all open events occur the same day an email is sent. That means that open rate data is tied to the actual emails sent on a particular day.

Bounce and block codes are the codes as returned by the remote SMTP server after having been de-personalized. Meaning, unique identifiers present in SMTP codes are removed so that SMTP responses can be grouped for analysis. In certain cases, such as when the email is being relayed through an intermediary SMTP server, the remote SMTP server may not be the same as the MX record for the domain. SMTP codes are categorized as "bounces" vs "blocks" by internal human review. Bounces generally indicate an invalid email address. Blocks generally indicate a rejection of the email message but a valid email address.

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