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Can't send email - SMTP server fails to connect

Every time I try to send an email, I get a message saying "Mail Server Password Required," but when I enter the password the same message just keeps appearing; after 2 or 3 times I'll get a notice that the SMTP connection has failed. The thing is, this didn't start until the end of the day yesterday, after I tried to send an email flier out. Because we've accidentally overloaded the server before, I was sending it to approx. 50 addresses at a time. That worked five or six times before the password message suddenly appeared; I'd been sending mail just fine earlier, as well.

We have a POP server, Windows XP, Thunderbird 2.0.0.23, no extensions or add-ons. Our outgoing mail is through Verizon (not our incoming, which seems to be working fine), but I contacted them and we're using the right port, etc. The password and username work when I log directly onto the Verizon account, so Verizon's pretty sure the connection problem lies with Thunderbird somehow.

I installed Thunderbird about a month ago, because our old Mozilla mail crashed. Tthis isn't the first time we've had problems with the SMTP. The problem last time seemed to be because our postage printing program, Dazzle, wasn't compatible with this version of Thunderbird, and would close every time it tried to generate an automatic email (after stating problems with the SMTP server connection). Our incoming mail is through a small provider, as was our outgoing mail. One of the things we did last time to fix the SMTP issue was to switch our outgoing mail from them to Verizon. We also had to jury-rig our internet options, in an attempt to create a route-around for Dazzle, so that the default email was Mozilla, not Thunderbird. I should add that this was because the official route-around -- switching the mail default to some completely different program, like Outlook, then reopening Thunderbird and setting it as the default -- didn't work. However, none of the tech support could say exactly why having Mozilla as the default made everything function relatively smoothly.

I've tried doing the same things as last time: closing all the programs, switching the mail default to Outlook, then opening Mozilla and setting it as the default. I've tried setting Thunderbird as the default, too, which hasn't worked either. I'm using the right password; the outgoing port is correct, according to our provider.

So what's wrong? What made Thunderbird suddenly require a password for outgoing mail, and why can't I get it to recognize that password when I enter it? More importantly, is there anything I can do just to so we can send email for the time being?

Thanks for your help,
Kate
 
sad I’m frustrated
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