I suggest you contact you provider (spintel) and confirm what their acceptable use policy for sending mail is. My guess is your list has to many names on it, or you have sent to many mails in a 24 hour period. But all I can do it guess, or look up their policy on their web site.

Thanks, Matt. Yesterday I spent hours attempting to get information from Spintel. It's like they've built a solid brick wall around themselves. They have a 'Chat' system that is useless. You only get to 'chat' with a computer that just throws back pathetic and irrelevant suggestions at you, and it's almost impossible to find any other way of 'talking' to them. I've searched their website for policy information. There's lots of it, but nothing about limitations on email numbers. I agree with you that this problem must be just that, and they must have reduced the limits recently. So I gave up, broke my big list into a bunch of small lists, each with 20 or less addresses. That worked, but instead of one send, it's now 6. Ho hum! Thanks again. David

you might ant to look at using the mail merge addon. It sends one email to eaxh person on the list, personally addressed. So you only do one mailout.

https://addons.thunderbird.net/en-US/thunderbird/addon/mail-merge/

Hi Matt. First, I tried installing 'mailmerge' through my TB Add-ons Manager, which responded the add-on was not compatible with TB 7.8.3 (That's my TB's version number.) So I tried through the TB website. It installed with no problem. It seems to work OK provided you don't want an attachment on the email. With an email attached before hitting 'mailmerge', it opens the mailmerge options box, from which an attempt to send results in a 'copy failed'. error. If you hit mailmerge' with no attachment to the email, then try to attach through the facility in the options box, the 'attach' facility doesn't work! (It has a blinking cursor, but all I can do is type in. Can't paste in a file path or 'drop' a file on it, and if I type in a file path, the copy failure error occurs when I try to send, and nothing gets sent. Thanks for the suggestion, however. Cheers David