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.

Emails Sent to comcast.net: 15,818,826

Open Rate to comcast.net: 2,070,962 (13.1%)

Date range:
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Sent vs Opens for comcast.net

Date Sent Opens Open Rate
7/26/2021 15,052 1,282 0.0%
7/25/2021 8,022 774 0.0%
7/24/2021 10,243 958 0.0%
7/23/2021 18,943 1,910 0.0%
7/22/2021 16,887 1,696 0.0%
7/21/2021 17,367 1,848 0.0%
7/20/2021 16,300 1,992 0.0%
7/19/2021 13,908 1,759 0.0%
7/18/2021 8,309 954 0.0%
7/17/2021 10,760 1,533 0.0%
7/16/2021 20,507 3,602 0.0%
7/15/2021 15,879 1,816 0.0%
7/14/2021 23,874 3,096 0.0%
7/13/2021 21,645 3,016 0.0%
7/12/2021 24,304 2,599 0.0%
7/11/2021 12,033 2,101 0.0%
7/10/2021 14,100 1,653 0.0%
7/9/2021 18,405 2,521 0.0%
7/8/2021 22,506 3,261 0.0%
7/7/2021 18,389 2,677 0.0%
7/6/2021 18,748 2,624 0.0%
7/5/2021 16,023 2,647 0.0%
7/4/2021 12,992 2,189 0.0%
7/3/2021 13,103 2,207 0.0%
7/2/2021 17,348 2,128 0.0%
7/1/2021 19,285 2,263 0.0%
6/30/2021 26,217 2,848 0.0%
6/29/2021 17,994 2,359 0.0%
6/28/2021 16,653 1,969 0.0%
6/27/2021 8,521 859 0.0%

Blocks from comcast.net

No blocks during specified time frame

Bounces from comcast.net

Message Count
550 5.1.1 Not our Customer 3,981
550 4.2.0 Not our Customer 722
550 5.1.0 Invalid sender domain 539
550 5.1.1 recipient unallocated 95
552 5.1.1 recipient rejected - extended quota violation 91
550 5.2.0 - Recipient unavailable 77
450 4.2.0 - Recipient temporarily unavailable 53
Reached max queue time 47
550 5.2.0 Not our Customer 41
452 4.1.1 user over quota 24
550 4.2.0 recipient unallocated 14
DNS Error. DNS type 'mx' lookup responded with code NXDOMAIN 14
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. 10
550 5.4.5 Daily user sending quota exceeded. - gsmtp 8
SMTP; 550 5.1.1 Not our Customer 7
The group has exceeded its quota for total number of bytes sent. 6
NoMxRecord:0-0 5
452 4.1.0 ... temporary failure 3
550 5.4.6 : Recipient address rejected: Recipient Quota Exceeded 2
550 5.1.10 Recipient not found by SMTP address lookup 2
452 4.2.0 user over quota 2
535 Incorrect authentication data 1
552 1 Requested mail action aborted, mailbox not found 1
550 4.2.0 Invalid sender domain 1
421 4.1.0 192.185.26.22 Throttled - try again later. Please see http://postmaster.comcast.net/smtp-error-codes.php#RL000003 1
550 5.1.8 Access denied, bad outbound sender AS 1
554 5.2.2 mailbox full; Failed to process message due to a permanent exception with message Cannot open mailbox Administrative Group System Attendant. 16.55847E000000, 17.43559, 20.52176FD9851200000000000000, 20.50032FD98582174010F1030000, 255.23226FD985, 255.27962:FE000000, 255.17082:DD040000, 0.26937, 4.21921:DD040000, 255.27962:FA000000, 255.1494, 0.50608F010480, 5.29818D643339662D343434372D616637642D35366234373236353234333300000780, 1.29920, 7.29828:BAB61BD90000000005000780, 7.29832A010480, 1
553 5.7.1 sorry, that domain isn't in my list of allowed rcpthosts 1
550 5.2.0 recipient unallocated 1
554 5.1.0 50.31.62.95 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000 1
334 334 535 5.7.3 Authentication unsuccessful 1
550 5.2.0 Message rejected due to DMARC. Please see http://postmaster.comcast.net/smtp-error-codes.php#DM000001 1
5.1.0 - Unknown address error 550-'5.1.1 Not our Customer' 1
550 References header is too long 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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