Email Blocked Sometimes Due To My Comcast IP?

3 replies
Hopefully I have this posted to the correct forum............

Anyhow, sometimes I have a problem with email blocked due to "my" Comcast IP listed on Spamhaus. According to Comcast, all their residential IP's are automatically listed with Spamhaus so it's impossible to have it removed and the only way to get a clean IP is to pay extra for their business class service which I'm not about to do.

I have a dedicated server with my own IP's that I send all my email SPAM just replying to customers and questions. None of those IP's including the primary IP is on any blacklist. My IP and server name is in the header listing where the mail was sent from along with pass SPF records.

The problem stems from a line near the bottom of the header which lists the sending computers name along with the Comcast IP, which is sometimes blocked.

One would think this shouldn't matter as the mail is actually being sent through my server, although it does (sometimes) as the problem is erratic.

On another note, I also have a Gmail account set up in Outlook. During times when I'm having difficulty sending email using one of my domain addresses, I'll use the Gmail account through Outlook. Although when examining the header of the mail sent using Gmail with Outlook, this also lists the sending computers name along with the Comcast IP yet is never blocked?

Any thoughts on how I might resolve this are appreciated. Thanks.
#blocked #comcast #due #email
  • Profile picture of the author David Beroff
    I'm not clear where your dedicated server sits. If it's on your side of your Comcast modem, then yeah, you're running a business-class service on a residential IP, and I respect what Spamhaus and Comcast are saying, for about a dozen good reasons. (Yes, I understand that you're wearing a white hat, but there are literally millions of IP's on their network, and put yourself in the shoes of trying to police the bad guys.)

    If your server is outside of Comcast's network, then you should be able to connect to it directly, i.e., not using email, and that should take care of this particular issue. (If you're simply mailing to it, then I can see the issues you describe, since the mail is still originating on your side of the modem.)

    Have you considered an independent mail service? I use Mailgun for one client, and they have an API so you don't have to use email to first reach them.

    Just to be clear: I have no love for Comcast, but they'd really be in a no-win situation if they were to allow mail servers on residential service. I worked with a far smaller provider, and they had to be just as rigid on this point, so as to block potential nightmares.
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  • Profile picture of the author MoreBeer
    Thanks for the reply. What I did is setup my outgoing mail from home to use Amazon SES which strips the Comcast IP, etc from the header and signs it using DKIM's from Amazon. I've been using Amazon SES for promo mail to my users for a while, might as well use them with individual email from home. I have Comcast business class service at my office which includes a clean IP. Their residential IP's are a nightmare as they're all listed on Spamhaus.
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  • Profile picture of the author Stfenhuse
    What was your rationale for not outsourcing your email services to something like Mailchimp or Mailgun?
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