Sending mail from non-BT accounts

Question

I have email accounts with Apple (mobileMe), my own domain (hosted by Verio) and another of my own domains (hosted by Network Solutions) - as well as the BTinternet.com email account. 
Until today, all four accounts were set up on my email client (Apple Mail) to use their own respective SMTP servers for outgoing mail, and all four have worked fine in this way for literally years. 
This morning, I started getting error messages trying to send mail from the domain hosted by Verio ("cannot send message using the server [my own domain's SMTP server]").
In the end, I followed the steps outlined in a thread on this forum to "add" the account to BTYahoo, verify it, and change the email client settings to use BT's SMTP server. So now it works fine.
What I don't get is why I had to change this one account, when the other non-BT accounts (Apple and NS SMTP servers) continue to work fine as they are (ie using their own server details for outgoing mail).
Anyone know the answer?  Obviously it works, so there's no problem (apart from wasting 2 hours this morning trying to figure out what the **bleep** had gone wrong), just curious as to BT's logic here.
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Answer 1

gregch wrote:
I have email accounts with Apple (mobileMe), my own domain (hosted by Verio) and another of my own domains (hosted by Network Solutions) - as well as the BTinternet.com email account. 
Until today, all four accounts were set up on my email client (Apple Mail) to use their own respective SMTP servers for outgoing mail, and all four have worked fine in this way for literally years. 
This morning, I started getting error messages trying to send mail from the domain hosted by Verio ("cannot send message using the server [my own domain's SMTP server]").
In the end, I followed the steps outlined in a thread on this forum to "add" the account to BTYahoo, verify it, and change the email client settings to use BT's SMTP server. So now it works fine.
What I don't get is why I had to change this one account, when the other non-BT accounts (Apple and NS SMTP servers) continue to work fine as they are (ie using their own server details for outgoing mail).
Anyone know the answer?  Obviously it works, so there's no problem (apart from wasting 2 hours this morning trying to figure out what the **bleep** had gone wrong), just curious as to BT's logic here.
Hi Gregch.
To be honest, the problem seems to be at the destination smtp service end and nothing to do with BT. You've not really supplied any details of the error message - is there anything else in the received message ?
You've assumed that it's a BT fault, rather than perhaps investigating the possible error at Verio. As the other accounts work as exists, it really does point at Verio (or indeed something local, perhaps a security package interferring etc).
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