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
2/4/2023 12,465 1,449 0.0%
2/3/2023 24,047 3,848 0.0%
2/2/2023 27,026 4,487 0.0%
2/1/2023 35,754 7,216 0.0%
1/31/2023 30,271 4,812 0.0%
1/30/2023 36,014 4,120 0.0%
1/29/2023 10,265 1,616 0.0%
1/28/2023 14,903 2,423 0.0%
1/27/2023 20,587 3,384 0.0%
1/26/2023 25,779 4,155 0.0%
1/25/2023 43,901 5,017 0.0%
1/24/2023 32,699 4,852 0.0%
1/23/2023 40,267 5,451 0.0%
1/22/2023 20,998 3,297 0.0%
1/21/2023 22,663 3,866 0.0%
1/20/2023 27,736 5,339 0.0%
1/19/2023 36,834 5,612 0.0%
1/18/2023 50,306 7,148 0.0%
1/17/2023 26,465 5,261 0.0%
1/16/2023 30,560 4,355 0.0%
1/15/2023 13,196 2,871 0.0%
1/14/2023 16,237 2,851 0.0%
1/13/2023 24,311 4,766 0.0%
1/12/2023 30,186 6,060 0.0%
1/11/2023 35,665 5,307 0.0%
1/10/2023 27,104 5,065 0.0%
1/9/2023 35,141 5,645 0.0%
1/8/2023 29,976 3,866 0.0%
1/7/2023 24,583 4,930 0.0%
1/6/2023 27,611 5,844 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 6,382
Email was deferred due to the following reason: 2,323
550 4.2.0 Not our Customer 1,715
421 4.1.0 159.183.105.191 Throttled - try again later. Please see https://postmaster.comcast.net/smtp-error-codes.php#RL000003 1,126
Reached max queue time 631
NoMxRecord:0-0 538
421 4.2.0 159.183.105.191 Throttled - try again later. Please see https://postmaster.comcast.net/smtp-error-codes.php#RL000003 227
552 5.1.1 recipient rejected - extended quota violation 170
550 5.1.1 recipient unallocated 136
SMTP; 550 5.1.1 Not our Customer 114
550 5.2.0 - Recipient unavailable 83
550 5.2.0 Not our Customer 73
550 5.2.0 Message rejected due to DMARC. Please see https://postmaster.comcast.net/smtp-error-codes.php#DM000001 47
450 4.2.0 - Recipient temporarily unavailable 47
550 4.2.0 recipient unallocated 41
551 SenderAuthorization: is not authorized to send emails to this service. 28
452 4.1.1 user over quota 26
452 4.2.0 user over quota 9
This email has been blocked due to PMF Policies. 7
550 5.1.10 Recipient not found by SMTP address lookup 5
553 sorry, that domain isn't in my list of allowed rcpthosts; no valid cert for gatewaying 3
Connection reset by peer 3
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. 2
554 5.1.0 66.96.184.2 Comcast block for spam. Please see https://postmaster.comcast.net/smtp-error-codes.php#BL000000 2
421 Too many sessions opened 2
550 5.1.1 is not a valid mailbox 2
550 5.2.0 recipient unallocated 2
The recipient server did not accept our requests to connect. 2
550-5.7.1 Messages missing a valid messageId header are not 550 5.7.1 accepted. - gsmtp 2
SMTP; 550 5.2.0 - Recipient unavailable 2
SMTP; 550 5.1.1 recipient unallocated 2
554 5.1.0 173.231.242.8 Comcast block for spam. Please see https://postmaster.comcast.net/smtp-error-codes.php#BL000000 1
550 5.4.6 Unusual sending activity detected. Please try after sometime. 1
550 5.7.520 Access denied, Your organization does not allow external forwarding. Please contact your administrator for further assistance. AS 1
554 5.1.0 199.250.217.82 Comcast block for spam. Please see https://postmaster.comcast.net/smtp-error-codes.php#BL000000 1
554 5.2.121 The sender has exceeded the limit for the number of messages they can send to this recipient per hour. For more information go to http://go.microsoft.com/fwlink/?LinkId=526653. 1
554 5.4.14 Hop count exceeded - possible mail loop ATTR34 1
SMTP; 554 5.1.0 148.163.149.245 Comcast block for spam. Please see https://postmaster.comcast.net/smtp-error-codes.php#BL000000 1
554 30 Sorry, your message to cannot be delivered. This mailbox is disabled . 1
535 Authentication Failed for 1
421 4.1.0 192.185.144.91 Throttled - try again later. Please see https://postmaster.comcast.net/smtp-error-codes.php#RL000003 1
554 5.1.0 66.96.184.1 Comcast block for spam. Please see https://postmaster.comcast.net/smtp-error-codes.php#BL000000 1
421 4.1.0 192.185.70.14 Throttled - try again later. Please see https://postmaster.comcast.net/smtp-error-codes.php#RL000003 1
DNS Error. DNS type 'mx' lookup responded with code NXDOMAIN 1
550 5.7.129 not authorized to send to recipient because the sender isn't on the recipient's list of senders to accept mail from 1
554 5.1.0 199.250.216.170 Comcast block for spam. Please see https://postmaster.comcast.net/smtp-error-codes.php#BL000000 1
552 5.2.0 User globalmediaadmin-bh-15.webhostbox.net administratively prohibited: cpanel account has violated hourly sending limits 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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