@Atilla_the_Tim wrote:
I know there's no typo, as I used the "Reply" button.
So have you tested it by creating a new message (rather than using the Reply button), then entering your contact's address manually and sending it from your VM email account?
The reason I ask is there is more to the "Reply" button than you might realise. Your contact in Germany may have set a "Reply To" address in their email to you. That is a standard email option and means that when someone uses the "Reply" button to respond to that message the reply will go to the specified "Reply To" email address rather than back to the original "From:" address.
If your contact mis-spelt the Reply To address it would mean you could have been sending to an invalid address without realising it.
To be fair, that is a facility more common in business than personal communications. However, it is there for anyone to use, you could set a "Reply To" address any time you send an email from Outlook for example.
Did you type out the address when you sent a test email from your work's email? If you did, I would suggest creating a new test email (without using "Reply") and sending it from your VM address.
If you get the same error message back at least we have ruled out one possible cause. 😉
Coenoby
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