in reply to Re^7: e-mail fails with address that is not a fully qualified domain
in thread e-mail fails with address that is not a fully qualified domain

I can see your very reasonable point?
I see you suggest I talk to the administrator but I am not sure who this is this particular case.
I get my broadband services from Virgin Media but use an e-mail account from bt (British Telecoms). Therefore does this make it bt that I should talk to? Using Thunderbird with the from address I am using does work OK.
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Re^9: e-mail fails with address that is not a fully qualified domain
by mr_mischief (Monsignor) on Jun 02, 2015 at 15:39 UTC

    You would need to talk to the administrator of the server to which you submitted the mail for sending. If it is then forwarded to another server for delivery, you'd want to speak to that administrator as well.

    A big part of software development is understanding with what your programs interact. In this case, not only do you have a human user but also the SMTP protocol and mail servers. I suggest becoming more familiar with how SMTP email works. The domain knowledge is invaluable to someone writing code for the domain.