Tagrate limiting

September 22, 2009

Technology does not trump policy when it comes to delivery

By laura
4 Min read
4 comments
22September

Recently Ken Magill wrote an article looking at how an ESP was attempting to sell him services based on the ESPs ‘high deliverability rates.’ I commented that Ken was right, and I still think he is. Ken has a followup article today. In the first part he thanks Matt Blumberg from Return Path for posting a thoughtful blog post on the piece. Matt did have a very thoughtful article...

March 30, 2009

Delivery can be counter-intuitive

By laura
2 Min read
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30March

We all know that receiving ISPs rate limit incoming email. With the volumes of mail that they’re currently dealing with they must do that in order to keep their servers from falling over. A client was dealing with rate limits recently. These were not typical rate limits, in that the recipient ISP was 4xxing mail. Instead, the recipient ISP was not accepting any incoming connections. The...

February 23, 2009

Soft bounces and rate limiting

By laura
3 Min read
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23February

What is your policy for handling soft bounces? What do you consider a soft bounce? What is the right thing to do about soft bounces? The first step in talking about soft bounces is to define them. When I talk about soft bounces, I mean mail that has been rejected with a 4xx response during the SMTP transaction. As described by RFC5321, when a recipient MTA responds with a 4xx it is telling the...

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