BTinternet/BTopenworld/BTYahoo! email sending problems

SMTP Problems using BTYahoo! mail system - 22-Mar-2008, updated 14-Dec-2011

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30-May-2013. BT announced that they will cease as a partner with Yahoo! This affects all services and any associations with Yahoo! including email, portal and other items such as Flickr. This will be happening in the next few months, and every single user will be affected. Users of email client programs (e.g. Outlook, Thunderbird, Windows Mail and Mac Mail) will almost certainly need to alter their settings.
The new partner is Critical Path -
The shortcuts and tips on this site will therefore be of no use after the changeover, due to be completed at the end of 2013. However I will try to provide new ones as needed.
See for further information at present
More details will be added as and when

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(For FROM - this depends on your mail client.)

If you are having problems sending from a BTYahoo!/BTinternet mail address, then it may be due to configuration changes on the Yahoo! mail servers that requires verification of the FROM address if it is different to the actual btinternet email address of the account itself. Typically, the error shows as :-

Task ' - Sending' reported error (0x800CCC0F) : 'The
connection to the server was interrupted. If this problem continues,
contact your server administrator or Internet service provider (ISP). The
server responded: 553 From: address not verified; see'

Note: This is not the same as smtp authentication! See my options 31 or 31a for details. These are now slightly out date due to this extra step.

Recent changes made to the Yahoo! mail servers (and hence to the servers used by BTinternet/BTYahoo!) has caused some problems for people. This also impacts on other Yahoo! partners, and the information in this page equally applies to them - but using their own ISP domain instead of

The problem seems to manifest itself when the mail account has a different sending or FROM E-mail address to the actual btinternet email address of the account itself.

For your own existing email addresses, this is a simple change to your email client just to make sure that the FROM email address is the same as the sending address (which may be without

As an example, in OE Mail account properties :-

General/E-Mail address :
Servers/Incoming Mail Server/Account name : username
Servers/Outgoing Mail Server/My server requires authentication "ticked" - press Settings. If "Log on using" is ticked, make sure that Account name is set as username

Another example for Thunderbird users :-

Tools/Account Settings... - pick mail account and look at the Account Settings
Email Address: (this is the FROM address)
Outgoing Server (SMTP) - you need to alter this to show the same account as the email address. If it does not appear in the list, it needs to be added as below. It may typically show "Use Default Server".
1. To add a sending account - on the left of the accounts list, go down to the entry Outgoing Server (SMTP), Click on it and then Click on Add
2. Discription (enter anything, it doesn't particularly matter in this case)
3. Server Name: - enter
4. Make sure Use name and password in Security and Authentication is ticked.
5. In Username: - enter username, where "username" is the existing email account stub portion before
6. Tick No against Use secure connection and press OK
7. Go back to the Account Settings of the mail account in question and then alter the Outgoing Server (SMTP) setting to pick up this newly created entry.
8. An initial email send will probably request a password. This is the password for the mail account.

Clearly this impacts mostly when users have their own domains and have variable "Sending" addresses, but still use the BTinternet mail servers for sending.

Here are some instructions for those having problems sending mail on BTYahoo!/BTinternet accounts specifically with their own domain names.

Yahoo! requires you to set up and verify "new" FROM addresses via the webmail system. It can be a domain address, either the forwarding type, or one with its own smtp server.

Once verified you can use that address as the FROM address for your email, and if it is a domain address with its own SMTP server, you will be allowed to use that SMTP server to send mail.

The relevant Yahoo! instruction page is :-

but it isn't particularly written with BTYahoo! accounts in mind, so here are the instructions for the BTYahoo! interface.

Let's assume you have a BTinternet/BTYahoo! mail account as follows, and you want to set it up to show the FROM field as (or another BTYahoo! account if you wish).

At the moment, doing this is giving you occasional or continual send errors.

0a - - this is the BT help pages mainly for webmail, it doesn't mention mail clients such as outlook express.
0b - - this is the BT help pages for verification, it doesn't mention mail clients such as outlook express, or what to do with them. However, what is worse is that it doesn't even mention to start in webmail! (Note: this has since been added)
0c - - this is the newest BT help pages for verification. The first paragraph is wrong, it will not fight spam.
Note: the above page did disappear, but is also available via

0d - Typically, you will verify against your primary email address initially. Hence the following assumes that you will login to your primary email address.

1 - Go to the BTYahoo! webmail page by your normal route (either via the BTYahoo! homepage, or direct via or via - for the latter enter your full email address for Yahoo! ID)

See sections 2 - 8 below, either choosing the Older interfaces table, or the New webmail interface - whichever applies to you

Menu Item Older interfaces
2 - Click Options/Mail Options (or More Options) or
3 - Click Accounts
4a - To add, configure and verify a new FROM address, click the Add Acount
4b - To verify an existing sending address highlight it and click on "verify this account"
5 - Enter an Account name: (doesn't matter what) for display purposes in the interface.

6 - Enter the display name of the email address you want to appear in the FROM field, in the box Your 'From' name: - this will appear as a display name in the FROM field of email sent from the account within webmail. It doesn't matter what it is if using an email client such as Outlook Express.

Then enter the email address that you want to appear in the FROM field, in the box Email address: - this must be a genuine email address as you will be sent a verification email to that address with a clickable URL and a confirmation code in it.

Note: An email address entered is converted to lower case. This is relevant for [12] below

7 - Receiving Mail - this item is usually not required via a mail client program, but if required the details should be self explanatory.
8 - Click on Save Changes. Either the verfication email is sent automatically, or Click on "Send code" in the small window, and BTYahoo! will now send a verification email to the FROM email address, and a green tick will indicate that an email has been sent.

Menu Item New webmail interface
2 - Click Options/Mail Options
3 - Click Mail Accounts
4 - To add a new FROM address, click the Add button
5 - Enter an Account Name (doesn't matter what) for display purposes in the interface. Enter the email address that you want to send FROM in the box Email address - this must be a genuine email address as you will be sent a verification email to that address with a clickable URL to confirm you actually "own" it. Then press Continue
6 - Receiving Mail - this item is usually not required via a mail client program, but if required the details should be self explanatory.
7 - You should receive a box as shown with the email address you want to send from. Hopefully an email will be received at that email address, so you can click the link within to acknowledge. Click the OK button.

You can alter the From by amending the Sending name. If you have not yet received an email, you can try to Resend Email

8 - This doesn't always work, and you may get the picture as shown, along with the spelling mistake. It gives no reason for the failure.

9a - If you are able to check the email address being verified without leaving webmail, then there will be a received email with a confirmation URL. There used to be a confirmation code. However the received email may only be a URL to click rather than a confirmation code.

9b - If you need to exit webmail to check the verification email address, then you can click on the URL in the verification email. It may need logging in again, and present a Yahoo! ID login box - enter your full BTinternet email address here, and then the password. Verification should happen automatically after a few seconds and a screen with a green confirmation tick will show

10 - Your should get an email sent to both email addresses, one to confirm to the original account that an email address wishes to be added. This new feature may negate the steps in 15a-c.
Note: There seems to be a bug with the system, as I have seen emails sent to previously deleted verified accounts implying that they were the account being added to!

11 - At present, there still seems to be a 10 email verification limit *per* BTinternet email address, and along with the other bug as in [10] there still appears to be residue memory effect for deleted accounts. This may still result in 553 errors. In these cases, you may get some joy by going to (entering your full email address as the Yahoo! ID if requested)

You can now send emails from using the "From" pulldown on the Compose page within webmail

12 - At this point you can 'Sign Out' of the mail interface, or you may like to add others if required - and then go to your ordinary pop3/smtp email client and set it up the way you want, with the new address in the FROM field. You need to make sure that the mail client is set to use the correct BTinternet email account as the smtp authentication account your new FROM address is within.

Unfortunately, the FROM address looks to be only checked against a lower case entry in webmail, so you have to use rather than in your mail client.

See my options 31 or 31a for smtp authentication details for various mail clients.

You should also be able to put the new address and its smtp server details as the smtp server for that account (as long as it does actually have the facility to send from an smtp server. If it is a BTYahoo! address then the smtp server would be '' and the username would be the bit before the, and password would be the one for that email address.

13 - For each domain email account you send FROM, you will need to follow these same steps.

14 - Still getting 553 errors from "Ghost" emails ?. This may be due to stuck read receipts. See for a possible cure.

14a - If you are using Outlook 2003, and have SP1 you will need to update to SP2 or higher. See for the update.

15 - If you receive 553 error messages, interrogation of the email content is needed. You should get two emails, one for the verification email address and the other for the account trying to send.
15a - The email received to the verification address is pretty much useless, it doesn't contain anything of value like the email address attempting to verify against it. So someone trying to verify against a address that isn't theirs, can get emails sent to a poor unfortunate recipient. This is not very clever. BT have actually done nothing about this despite repeatedly being informed.
15b - The email received to the email address attempting to be verified, contains text showing the email address to be verified against.

15c - It could be that someone has entered a wrong email address in a mail client account smtp settings. For example the user might have a period in their main email address portion, but actually enter it without the period. If the user then tries to send an email, it will fail to go - but there will be a 553 error email sent to the wrong email address. There will be no indication which email address attempted to send emails "using" the wrong email address, or indeed anything in the email headers.
The recipient of this email could then make unnecessary alterations to their mail settings, leading to possible problems that were not actually there. The email has a subject title of Error 553 Message . What you need to do, with the text as shown in the picture smtperror553.jpg (opens new tab/browser window). The link follow these simple steps goes to, and automated password reset tool goes to

15d - There is nothing that can be done if the only email being received is the one in 15a or 15c.

Words by Robert and myself