Thunderbird Lightning Calendar invitations won't deliver through smtp.frontier.com
Thunderbird 52.6.0 (32-bit) Enigmail version 2.1a1pre (20180315-2313) Microsoft Windows 10 Pro, v 1709, build 16299.309
1. Thunderbird Email messages deliver correctly through smtp.frontier.com using StartTLS encryption
2. Sent Lightning Calendar Invitations which used to work, now produce the error message "<UserHidden@hotmail.com>: host smtp.frontier.com[199.224.64.207] said: 554
5.7.1 <craig@myDomainHidden.com>: Sender address rejected: Access denied (in reply to MAIL FROM command)
3. Disabling and removing Enigma then restarting Thunderbird did not change Calendar Invite behavior, Calendar Invites still fail with the same smtp.frontier.com error message with Enigma disabled and removed.
Test environment; Send email/invitations from my own domain account which uses smtp.frontier.com for delivery, To: my gmail.com account. Login and encryption settings work for regular email over StartTLS encryption on port 587. Also tried SSL/TLS on port 465, which also works for email but not calendar invites.
I spent 1.5 hours with Frontier tech support trying to resolve this issue. Frontier Tech support says they use Yahoo.com for smtp.frontier.com email. They don't know how to resolve this issue. Regular Thunderbird email, with attachments does deliver through the smtp.frontier.com email system. Frontier support won't contact Yahoo for me, and all my attempts to contact Yahoo.com directly using my frontier.com email ID also fail. I am now contacting Mozilla Support for help.
I suspect the problem lies in one of two areas: 1. Mozilla Calendar Event Invitations use a different delivery system for calendar events than for regular email, which doesn't work with smtp.frontier.com. Email attachment of a calendar event does deliver through smtp.frontier.com (where calendar invitations fail 100%).
2. Yahoo has their front-end filtering set too strictly, not allowing calendar event invitations to be sent.
- 1-Only Mozilla Calendar Lightning developers can answer this issue.
- 2 I can't resolve myself, and will need Mozilla support to act as intermediary to Frontier/Yahoo.
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You are trying to send a message from Frontier using a domain that is not theirs. Or that is my guess given you have redacted sufficient information to make guessing mandatory.
IPs's that used to insist on email going through their servers are not refusing to deliver mail for any domain but their own. This is how it always was supposed to work, but there were some US based ISP's that apparently failed to read the manual. Now they are having issues as the receiving server are refusing delivery as mail from Hotmail for instance does not come from Fronteir, so it is obviously spam or using some dodgy relaying.
If you want to send mail from an account say Me@mydomain.com then you are required to have the registered SMTP server for mydomain.com and the SMTP that is sending the mail. If this is a domain you own, you might need to consult with your domain provider as to the correct mail servers to use.
Good information, but the problem still remains; I -can- successfully send email through Frontier's smtp.frontier.com, but -can't- send Lightning Calendar Invitations through the same Thunderbird configuration and IP. Your Hotmail example should experience the same issues, where outgoing email would succeed, calendar invites won't.
Both are being attempted from Frontier's internal network (Home IP), and using the same Frontier/Thunderbird configuration. Since I can successfully send email from myDomain through Frontier systems, this implies I am both configured correctly, and logging in to Frontier's smtp.frontier.com service with correct Frontier username/password.
I have a technical background and didn't redact anything relevant. However if you wish to see the complete unedited original response (in your shoes, I probably would) with originating email attachment, please provide an email address to continue this conversation. I'd rather not post the response message in it's unedited entirety in a public forum.
My email address is in my profile... please ink to this thread so I know what I am looking at.