Category: EMail

Apr 13 2013

Yahoo SMTP Deferrals Take 2

Well, our good friends at Yahoo are at it again. Once again they are deferring mail for no apparent reason. Nothing has changed on my system and yet they haven’t accepted a message to deliver to one of their users in 3 days (maybe more).  And, of course, there’s no way to actually contact a …

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Mar 27 2013

Tech Tip: Don’t use qmail as a mail server

A while ago I added a new anti-spam technique to my mail server setup called “No Listing”. No listing basically means putting a high priority MX record in the DNS that always rejects mail server connections.. It seems, however, that the qmail mail server can’t cope with that.  It’s not RFC compliant.

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Nov 20 2012


Here’s a tip for internet domain owners: Make sure the contact information for your domain has more than one email address.  And make sure at least one of those email addresses is not in the domain itself. If your email starts malfunctioning, you want people to be able to tell you about the problem … …

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Oct 25 2012

Blocking Mailbait

Recently I’ve been getting a lot of mail from the feedback loops I subscribe to indicating that someone has gotten a subscription confirmation message and they considered it spam. After digging into my logs I noticed a few things … The subscription requests are being initiated from TOR exit nodes. The web requests that initiate …

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Aug 07 2011

Android and sendmail

And you probably read in my last post … I had a problem getting mail setup my new Android phone. I could receive mail fine … but it failed (with a totally useless message) whenever I tried to send mail.  I was sure I had the settings right (userid, password, ssl, etc). I have my …

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Jul 24 2011

DNS: Sends No Mail

I really wish there was a way to indicate, in DNS, that a domain never sends mail. That way, if a mail server recieves mail claiming to be from that domain, it can be discarded out of hand. I’ve got a bunch of domains that JUST do web serving … they never send mail.  If …

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Feb 07 2011

Confidential Information

I saw a very interesting mail reject message today on one of my mailing lists … You are receiving this message because you have attempted to send an e-mail containing confidential information. Examples of confidential information include, but are not limited to social security numbers, birth dates, account numbers, policy numbers, medical history, financial history, …

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Nov 19 2009

Report as SPAM

It’s nice that many of the major mail providers give you the ability to report a message you’ve received as spam … but some of them make it far TOO easy to report something as spam. I’ve noticed that many of the big names put the “Report as spam” button way too close to the …

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Sep 04 2009

Feedback Loops

While doing a little searching, I found some information on email feedback loops for other major ISP’s.

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Aug 25 2009

Yahoo Complaint Feedback Loop Redux

A few months ago I commented on how much I liked the Yahoo Complaint Feedback Loop. Well, I think I’m going to revise that statement slightly.

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