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Error message about invalid address keeps happening

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I have been getting server messages saying that I was trying to contact an email account on Google that does not exist. Happened every day, sometimes twice a day. I checked my contacts in Thunderbird and indeed a bogus account was there, and I deleted it. I never tried to send any messages to that account. So, I am wondering if Thunderbird is checking my contacts to make sure they are all valid. I cannot think of any other explanation. Any ideas?

I have been getting server messages saying that I was trying to contact an email account on Google that does not exist. Happened every day, sometimes twice a day. I checked my contacts in Thunderbird and indeed a bogus account was there, and I deleted it. I never tried to send any messages to that account. So, I am wondering if Thunderbird is checking my contacts to make sure they are all valid. I cannot think of any other explanation. Any ideas?

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