Weird error from MPro

I'm having to send this via webmail as MPro has just become unusable for
me. I was truing to send an email to a new contact, and I now get the
recurring error, every four seconds or so, when I run MPro (8.40. The
message says " Error from Messenger: Transport command failed - No sender
specified in control file (1)"

This is with RISC OS 5.27 (RComp version) (30-Sep_2020)

I've repaired all of MPro's groups, but the error persisits.

If anyone cen tell me what to do about this I would be very grateful.

Best wishes,

Peter.




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