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: 11,879,919

Open Rate to comcast.net: 1,627,999 (13.7%)

Date range:
Display as:

Sent vs Opens for comcast.net

Date Sent Opens Open Rate
1/16/2021 15,212 1,239 0.0%
1/15/2021 17,847 2,101 0.0%
1/14/2021 19,099 2,250 0.0%
1/13/2021 21,945 2,111 0.0%
1/12/2021 19,488 2,141 0.0%
1/11/2021 19,649 2,176 0.0%
1/10/2021 11,725 1,348 0.0%
1/9/2021 17,895 2,161 0.0%
1/8/2021 22,533 3,075 0.0%
1/7/2021 26,809 3,577 0.0%
1/6/2021 22,661 3,357 0.0%
1/5/2021 20,914 2,922 0.0%
1/4/2021 16,040 2,006 0.0%
1/3/2021 9,603 1,006 0.0%
1/2/2021 8,050 1,024 0.0%
1/1/2021 12,429 1,404 0.0%
12/31/2020 13,983 1,806 0.0%
12/30/2020 18,041 1,719 0.0%
12/29/2020 12,989 1,560 0.0%
12/28/2020 11,760 1,530 0.0%
12/27/2020 6,204 791 0.0%
12/26/2020 7,018 878 0.0%
12/25/2020 8,343 969 0.0%
12/24/2020 13,851 1,614 0.0%
12/23/2020 16,713 2,355 0.0%
12/22/2020 16,067 2,148 0.0%
12/21/2020 14,165 1,935 0.0%
12/20/2020 8,367 1,192 0.0%
12/19/2020 11,434 1,319 0.0%
12/18/2020 15,848 2,123 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 4,358
550 4.2.0 Not our Customer 499
550 5.2.0 - Recipient unavailable 116
550 5.1.1 recipient unallocated 80
552 5.1.1 recipient rejected - extended quota violation 64
450 4.2.0 - Recipient temporarily unavailable 49
No IPs are available for this account 45
535 Incorrect authentication data 27
550 5.2.0 Not our Customer 25
452 4.1.1 user over quota 14
550 4.2.0 recipient unallocated 9
554 5.1.0 167.89.100.165 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000 7
421 Too many sessions opened 5
421 4.1.0 192.185.85.20 Throttled - try again later. Please see http://postmaster.comcast.net/smtp-error-codes.php#RL000003 4
421 4.1.0 192.185.30.21 Throttled - try again later. Please see http://postmaster.comcast.net/smtp-error-codes.php#RL000001 4
421 4.1.0 192.185.86.53 Throttled - try again later. Please see http://postmaster.comcast.net/smtp-error-codes.php#RL000003 3
421 4.1.0 192.185.31.49 Throttled - try again later. Please see http://postmaster.comcast.net/smtp-error-codes.php#RL000003 3
421 4.2.0 149.72.202.13 Throttled - try again later. Please see http://postmaster.comcast.net/smtp-error-codes.php#RL000003 3
SMTP; 550 5.1.1 Not our Customer 3
550 5.1.10 Recipient not found by SMTP address lookup 3
421 4.1.0 192.185.3.61 Throttled - try again later. Please see http://postmaster.comcast.net/smtp-error-codes.php#RL000003 3
554 5.1.0 167.89.100.167 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000 2
Email was deferred due to the following reason: 2
550 Could not send message at it contains too many spam like characteristics 2
550 5.5.0 Requested action not taken: mailbox unavailable. 2
452 4.2.0 user over quota 2
SMTP; 554 5.1.0 148.163.135.74 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000 1
421 resimta-po-46v.sys.comcast.net resimta-po-46v.sys.comcast.net Too many sessions opened 1
554 5.1.0 192.185.145.107 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000 1
421 4.1.0 192.185.126.2 Throttled - try again later. Please see http://postmaster.comcast.net/smtp-error-codes.php#RL000001 1
421 resimta-po-35v.sys.comcast.net resimta-po-35v.sys.comcast.net Too many sessions opened 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
554 5.7.1 : Recipient address rejected: You have exceeded the limit of 200 messages per hour and per account. Please, re-try later. 1
Failed to process account credentials. 1
554 5.1.0 192.185.50.104 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000 1
554 5.1.0 192.185.196.23 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000 1
554 5.1.0 192.185.51.56 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000 1
554 5.1.0 192.185.47.129 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000 1
550 5.4.317 Message expired, cannot connect to remote server 1
554 5.1.0 192.185.51.162 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000 1
550 5.2.0 recipient unallocated 1
554 5.1.0 192.185.47.144 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000 1
554 5.1.0 192.185.51.36 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000 1
421 4.1.0 192.185.15.239 Throttled - try again later. Please see http://postmaster.comcast.net/smtp-error-codes.php#RL000003 1
554 5.1.0 192.185.51.253 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000 1
550 5.2.0 Message rejected due to DMARC. Please see http://postmaster.comcast.net/smtp-error-codes.php#DM000001 1
554 5.1.0 192.185.145.171 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000 1
554 5.1.0 192.185.148.200 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000 1
Storage quota exceeded 1
550 5.7.133 authentication required; Delivery restriction check failed because the sender was not authenticated when sending to this group 1
554 5.1.0 192.185.143.39 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000 1
421 4.1.0 192.185.85.20 Throttled - try again later. Please see http://postmaster.comcast.net/smtp-error-codes.php#RL000001 1
554 The domain is unverified and requires DNS configuration. Log in to your control panel to view required DNS records. 1
421 error proxying data: recv: read tcp 50.31.49.181->96.114.157.80: read: connection timed out 1
SMTP; 550 5.2.0 - Recipient unavailable 1
421 4.1.0 192.185.13.3 Throttled - try again later. Please see http://postmaster.comcast.net/smtp-error-codes.php#RL000001 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:D1020000, 1.36674, 1.61250, 1.45378, 1.44866, 1.36674, 1.61250, 1.45378, 1.44866, 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, 16.55847D010000, 17.43559BE030000000000000000000000000000, 20.52176F748E1C0010101F000000, 20.50032F748E8C170 1
550 5.7.1 Connection refused - 1
554 5.1.0 192.185.145.18 Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000 1
550-5.7.1 Our system has detected that this message is 550-5.7.1 likely suspicious due to the very low reputation of the sending 550-5.7.1 domain. To best protect our users from spam, the message has been 550-5.7.1 blocked. Please visit 550 5.7.1 https://support.google.com/mail/answer/188131 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.