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  1. #1
    Junior Member
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    Jan 2012
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    I have a number of web sites and I use smtp servers for sending emails e.g.
    smtp.mydomain.co.uk using Thunderbird and Outlook Express.

    Recently I have been unable to send emails resulting in error messages to do with the smtp servers.
    I have taken my pcs to work and used their internet connection and everything is ok proving that the equipment is ok.
    I have contacted my broadband supplier and they said "Oh yes, we block all
    3rd party smtp servers, you might be ok if you pay extra for a static IP address!"

    I was amazed by this response. Has anyone had the same experiences and can anyone recommend an ISP that doesn't block any services?

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  3. #2
    Senior Member Webzarus's Avatar
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    Here's usually a work around like using non standard ports for the traffic.

    Perhaps ssl ? The reason why most ISPs block it is because all the botnets in the world use open smtp relays, as well as many Trojans now use smtp mail connections to send data collection back to their creator.

    Depends on where you are in the world as to if there are still any ISPs that are not blocking smtp to 3rd party.

    My ISP has been blocking it for about 10 years now. But there's always a work around for it.

  4. #3
    WDF Staff Wired's Avatar
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    Are you doing mass emails from your home?
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    Admin at houseofhelp.com

  5. #4
    Senior Member Webzarus's Avatar
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    Nope, but many email clients use smtp to send. ISP's generally block all smtp traffic except for their own. Even gmail uses SMTP for sending, but they have ssl enabled for those that need it.

    Yes, you can generally configure smtp to send your third party emails using your ISP smtp by it just putting your return address as your original, the problem with that is many business firewalls monitoring email like forefront, use a reverse dns verification and if the SPF records don't match up, the mail is flagged as spam or quarantined.

    Generally not good if your running a business from home using a domain email address and your mail to some clients gets bounced as questionable or spam.


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