[IMail Forum] Question

[Admin]

I am trying to e-mail a prospective client.  When I first contacted  e-mail
worked fine.  Now I cannot reach him, Imail sends the following error.

Invalid final delivery userid

This has been going on for two days, yet he can send me mail.  All my
replies are returned.  I was able to e-maill him twice then this started
about an hour after the second successful e-mail.

I sent a mail via my dial-up account instead of my imail server and it
apparently has  gone through.
Can anyone tell me why this might be happening?

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