Bypass email blockade.

By Healer ·
Many ISPs do not allow emails be sent through them where the smtp is set to other ISP. It is very inconvenient while travelling. How can we bypass the blockade?

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Non-ISP email?

by seanferd In reply to Bypass email blockade.
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It seems that this is a known fact.

by Healer In reply to Non-ISP email?

I use my laptop in a public library. I can receive emails but I can never send emails.

Say for example if you take your laptop to a friend's place whose network connects to an ISP other than yours. Very likely you will never be able to send email.

I do not think it has anything to do with proxy. Could you please explain a bit more of your response.

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by seanferd In reply to It seems that this is a k ...

1. Use an email service - Yahoo, Google, whatever MS calls their offerings these days - that is not linked to an ISP. In anticipation, I will note that I mean a generic Yahoo account, not an SBC/AT&T Yahoo account or similar.

If the mailserver doesn't belong to an ISP, it will not balk at your IP address.

2. Proxy - Use a proxy server to reach your ISP's mailserver, where the proxy has an IP address within your ISP's IP blocks.

3. Additional - VPN into your home computer (or whichever computer normally uses this ISP account, if you are allowed) to send mail.

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Thanks I was expecting

by Healer In reply to Clarifications.

something that could be done without so much extra work because visits to such places are usually very brief, casual and sometimes unexpected and unplanned.

It doesn't even work with GMail.

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GMail? Really?

by seanferd In reply to Thanks I was expecting

I don't know how an ISP could be expecting certain IP addresses in relation to a non-ISP-branded mail service. The ISP would essentially have to block <i>all</i> access to GMail.

Have you tried the webmail interface? (Yeah, I don't much care for webmail, either.)

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I did not try web mail at the time.

by Healer In reply to GMail? Really?

But I believe it should work because this is how other people access HotMail or GMail in the library.

There must be a header in the message saying the message is heading to another outgoing mail server.

I suppose web mail like GMail and HotMail would have different headers in the messages.

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by TobiF In reply to I did not try web mail at ...

Believe it or not, but they send mails all over to port... 25.

And even the AU operator mentioned above has instructions on their help pages about where companies could turn to open up port 25 for their mail servers...

And, visiting a webmail service isn't any problem at all.
Further, if you enable smtp/pop access to your gmail account, you can, most probably, set up your client to send mail via gmail from all over the internet. And that's ok with your ISP, since they know that gmail will filter spam and demands logon credentials before anything is accepted.

In addition, gmail was among the first mail providers to enforce encrypted connection for pop/smtp/imap.

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No that's not right

by OH Smeg In reply to I did not try web mail at ...

The Mail Header should be the same as you would normally send as it's originating from your ISP's Mail Server not the Access Points Web ISP.


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They are protecting themselves from becoming sources of spam

by TobiF In reply to Bypass email blockade.

Many ISP block outgoing traffic to SMTP (TCP port 25) except to their own mail servers. (unless the sender is a known good mail server)

This way, they protect their network from becoming the originator of spam, sent directly to mail servers of the addressees.

The root to the problem is that port 25 for long was used both for <i>submitting</i> mails from users to their mail server and for <i>forwarding</i> mails from the outgoing server to the incoming server of the recipient. And, for forwarding, no login is needed! (By the way, you may still find servers for submission of mail, where login credentials are not needed!)

Recently, most email providers have set up an additional entry point for submission of emails (with use of login and, possibly, encryption). Typical TCP port number may be 465, 587 etc.

Check with your email provider what settings they offer for email submission.
Once you update your client settings, you'll be able to send email from most places.

- webmail access to your home accound.
- If you activate pop/smtp access on gmail, then you can use that from your client. With some configuration, it is even possible to indicate your ordinary email address as the sender of the mail! (Oh, and gmail via pop/smtp enforces encrypted communication, which is good, but you need to configure it correctly.)

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I do know why ISPs do all these.

by Healer In reply to They are protecting thems ...

I suppose the problem is not with our own ISPs. It is the ISP of the network wherever we happen to be blocking the outgoing emails. Do you think so? Please comment!

All my outgoing emails are using port 587 SSL, incuding those with GMail. However they are still blocked. I am going to ask my ISP anyway.

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