system
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Thanks for the clear answer, kitto! 
But note to Avast!: Iāve now deactivated the signature notice in my outgoing emails, BUT Iād be happy to include it if it was TEXT-ONLY! I read most email on my Android phone (as do many of my correspondents), and I BCC my mail to myself. When I get one of those emails, it always has a button āShow Picturesā, even if the actual email is text only! Itās only to get rid of that #$%^& graphic logo, that Iāve deactivated the whole Avast! signature notice.
Is there any way to make it a text-only notice?