Jump to content

Use Tch Smtp Server


Recommended Posts

I need to use smtp server at TCH, but I get this error message:


Could not send - the SMTP server replied:

Administrative prohibition

(SMTP server error 550)


What must I do to make it work? This is a POP3 account, and I'm using an old version of Mailwasher.

Link to comment
Share on other sites

Normally I'd agree with you about bouncing messages. But when dealing with CANSPAM compliants who got my address due to a friend having a virus and subscribing me to loads of bulk e-mail lists, it's probably the best way.


So I'm pretty miffed that most of the mails can't be bounced. I NEED TO BOUNCE THEM!


So what is this administrative prohibition anyway?

Link to comment
Share on other sites

I found this doing a google search.


Sender Verification

Some mail servers now attempt to confirm the sender of a given piece of mail by verifying that the From: address provided is a real one. For example, if you send a piece of mail claiming to be "From: bob@someisp.com", and you send that mail to "sam@someotherisp.com", the mail servers at "someotherisp.com", may contact the servers at "someisp.com", to confirm that "bob" really is a valid mailbox there. If the return address proves to be false, the mail may not be accepted by the "someotherisp.com" servers.


Usually in the case of sender verification, the bounced mail will indicate that the verification attempt failed. The only solution is to use your real working return address on mail you send to this more-selective mail server. For example, if you sent mail out with the from address of "MegaSalesbob" or "REMOVEbob" instead of your real mailbox name of just "bob", that could cause sender verification to fail. Always use your real return address in e-mails if you want them delivered.


Because some mail systems accept all mail, including mail that is for non-existent mail boxes, sender verification systems will usually test to see if the other mail server returns accurate answers. It does this by starting to send mail to a mailbox address on the claimed source system that is extremely unlikely to exist. It then looks to see if that mail server rejects the made-up address or not. If the made-up address is rejected, then the original mail address is tested to see if it is accepted or rejected.


When a Sender Verification attempt fails, the message is usually never accepted by the destination system. It is rejected with messages like these:


  550 Sender verify failed


  550 sender verify rejected exim


  550 verify validity


  550 administrative prohibition "mailserver verify address"


  550 message to verify they are valid


  550 Sender verify failed - upgrade your firewall firmware or settings


  550 Not sent - no reverse lookup


  550 The destination mail system rejected your return address


  550 Sender must exist

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Unfortunately, your content contains terms that we do not allow. Please edit your content to remove the highlighted words below.
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...