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FastMail Forum All posts relating to FastMail.FM should go here: suggestions, comments, requests for help, complaints, technical issues etc. |
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21 Mar 2019, 10:47 PM | #1 |
Essential Contributor
Join Date: Oct 2004
Location: Baltimore, MD Suburbs (US)
Posts: 237
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Comcast throttling Fastmail?
I was replying to an email from my neighbor. Never had a problem reaching her before, but I got a message yesterday saying it couldn't deliver after an hour, then today that it couldn't deliver the message at all. It included the following:
Throttled - try again later. Please see http://postmaster.comcast.net/smtp-e...s.php#RL000001 Is this a FM issue? Comcast? I'll try emailing her through my Gmail to see if there is a different result, but wanted to at least ask about this. |
21 Mar 2019, 11:50 PM | #2 | |
The "e" in e-mail
Join Date: May 2003
Location: mostly in Thailand
Posts: 3,084
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The Comcast link you provided indicates that the problem is this:
Quote:
FastMail usually responds pretty quickly to being listed on spam blocklists. However, you could file a support request just in case they have not yet become aware of the problem. |
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21 Mar 2019, 11:51 PM | #3 |
Essential Contributor
Join Date: Dec 2017
Location: Scotland
Posts: 483
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The information at that URL says that Comcast are limiting inward emails because the sender (FM, if you're using FM's SMTP server?) is trying to send too many mails. You'd need to ask FM why that's happening.
It may be that FM always send lots of mail to Comcast, or perhaps there's a spammer using FM's servers to deluge Comcast recipients. |
22 Mar 2019, 02:28 AM | #4 |
Essential Contributor
Join Date: Oct 2004
Location: Baltimore, MD Suburbs (US)
Posts: 237
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Okay, I'll elevate to FM directly. Thanks.
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22 Mar 2019, 10:50 AM | #5 |
Essential Contributor
Join Date: Apr 2002
Posts: 280
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After reading this thread I sent a message from my fastmail account to my comcast account. I didn't get it so a couple of minutes later I sent another message. I got the second message less than a minute later.
Later in the day I got a message in my fastmail junk folder that said the message could not be delivered for more than one hour, and was throttled. Over 12 hours later I still haven't gotten the first message. Once the second message was received why didn't the retry for the first message eventually work? host mx1.comcast.net[96.114.157.80] said: 421 4.1.0 66.111.4.29 Throttled - try again later. Please see http://postmaster.comcast.net/smtp-e...s.php#RL000001 (in reply to MAIL FROM command) |
23 Mar 2019, 12:18 AM | #6 |
Essential Contributor
Join Date: Dec 2017
Location: Scotland
Posts: 483
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No-one here knows the answer. You need to ask Fastmail directly, so they can examine their SMTP server logs and see how often they tried to send the message to Comcast and what happened each time.
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