Try with Windows running in safe mode or temporarily remove (not disable) Trend Micro.

Thank you for responding sfhowes. Unfortunately neither of these suggestions solved the problem. I got the exact same error message as I have for the past 48 hours each time I have tried to send an email.

Regards.

click the fetch certificate link. What does the tab that opens say?

Hi Matt, The "Fetch Certificate" for the Outgoing Server says "Failed to fetch the certificate for mail.optusnet.com.au:25."

Does that help? I have no idea. Thank you.

Hello again Matt. Further to my previous reply, I did a search for my own benefit, and came up with this AI generated response: - (attached) This seems to me - correct me if I am wrong, please - that "STARTTLS" is a certificate in itself or replaces a certificate.

Regards Flin

Gday Flin I am also with OPTUS and this started for me Friday night The OPTUS rep told me he was getting lots of calls re this so add me to the mix. re the certificate download check, i dont see that??? Andrew

Hello Andrew. Interesting that you have the same problem and are with Optus. When you say "I don't see that" re the certificate check, do you mean you get a different result, or you can't locate the certificate check?

Flin

Gday Flin Re the certificate check in your screenshot, there is a "Fetch certificate" link at the bottom of your settings data When i open my Account settings page ( and even when i try to edit them ) that link does not show on my screen for "Outgoing Server ( SMTP) settings " Andrew

Sorry Andrew, I can't help with that. Mine comes up automatically with selection of Outgoing Server. I have had a look through TB settings etc., but can't locate anything that indicates that that 'tab' is selectable. Regarding your comment that you experienced this problem from Friday (21st), it got me thinking about TB updates. I then found that I had an update on 21st November, to version 140.5.0esr at 4:41;37 (Mozilla Time). Coincidence or not??? I have been trying for over an hour to find a way to go back to my previous version (140.4.0esr), to see if that solves the problem. I cannot find a way to either revert back or install that 'older' version. All of the searches I've done point to being able to uninstall TB and then re-install selecting the required version. I have not found that option anywhere, and have finished up back on version 140.5.0 (which seems to be shown as 145.0.0. on TB. Short of starting another question, to ask if there could be a problem with the update, I don't know what to do. (I am even considering going back to the dark side and installing MS Outlook). Regards Flin

Gday Flin I am still on W7 and i get Version 115.18.0esr | Released December 11, 2024 soooo, in theory, no recent updates for me ( that are registered ). I see a third thread is running in parallel by SueB who is also suffering but with a Mac, and started the same day 21st Talking to OPTUS so far is making my eyes bleed as they point blank say its not them :-) Wonder who my member of parliament is :-) Andrew

Gday Flin OK, just found a thread on the local Whirlpool forums down here https://forums.whirlpool.net.au/thread/9kpyn6py?p=-1 Basically, in it they advise to change the data to

Server Name: mail.optusnet.com.au Port: >>>465<<< Authentication method: Normal password Connection Security: >>>SSL/TLS<<<

I just tried it and it didnt work until i rebooted TBird On next send, i had to reconfirm my password but it seems to be working. Andrew

Hmm my post disappeared I just found a post on the whirlpool forums down here re this The answer was set the details to

Server Name: mail.optusnet.com.au Port: >>>465<<< Authentication method: Normal password Connection Security: >>>SSL/TLS<<<

It doesnt work immediately, you need to reboot TBird On the next send, you get asked for password, but then it sent :-) Andrew

Hmmm. I guess that shoots down the theory that I was developing, that it was a TB update problem. I'll keep searching for an answer, and if I find one I will post it on here. Best of luck in your endeavors too. Flin

Gday Flin I have posted replies but they arent showing????? Based on a post from the whirlpool forums changing the port and mode fixes the "current" problem use port 465 and change security to SSL/TLS Restart TBird and it should work Andrew

Thank you very much Andrew. I just checked my inbox 5 minutes ago and found the last 3 messages from you (they apparently came in an hour ago, then 15 mins and 10 minutes ago respectively). I have just carried out the changes, and also had success with sending a test message, following your suggested procedure. I am very grateful for your persistence, and help with resolving the issue. Too bad Optus didn't come up with it when you had your chat with them

I will now mark this "Solved", with great pleasure. Best wishes

Gday Flin Dont thank me, thank the gurus on whirlpool I just found their post by accident whilst googling in desperation :-) I still think it has something to do with what SueB found from a few years back ( ie OPTUS/??? are blocking port 25 ) but thats all beyond my paygrade :-) Andrew

That's great, Flin! I am still trying, have done what you've done, as suggested by Andrew, but not successful. All different combinations of ports and security etc. Waiting on Optus to give me result of their investigation. Fingers crossed.

Hi Sue, Sorry to hear that the solution that worked for both Andrew and I has not solved your issue. Hopefully Optus will come up with an answer for you soon. I have had experience though, with various issues, that theses communications companies - not just Optus - are not very good at communicating. Best wishes. Flin

Been busy sitting in a combine/header for the best part of a week (we have been rained out), this thread is somewhat enlightening to read on my return.

@sue, just one common issue here is folk changing the incoming settings not the outgoing ones and https://support.mozilla.org/en-US/questions/1549970#answer-1781532 exclusively sending setting that would be set in outgoing server (SMTP) although there is a link to that in the incoming identity as well it is best to consider incoming and outgoing as separate accounts entirely linked by your identity information.

Make sure your settings you are editing look like this screen capture from fin_judy before you click the edit button. It the layout of not looking correct you are not updating the correct settings.