outgoing mail suddenly cannot be sent due to server verification denial

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Level 1

63 points

outgoing mail suddenly cannot be sent due to server verification denial

My outgoing mail is being stopped and a popup message says "Mail can't verify the identity of the server "mail.twc.com".The certificate for this server is invalid. You might be connecting to a server that is pretending to be "mail.twc.com" which could put your confidential information at risk. Would you like to connect to the server anyway?

Then at the bottom is a ? mark, a show certificate button, a cancel button, and a continue button.

When I clicked on 'show my certificate' for the first outgoing email I tried, I first got the message the certificate had expired.

After a second outgoing mail was tried, I got the message of a 'dnvrco-oedge-vip-email.rr.com' Root certificate authority which was good until September 30, 2019 but there is a message that "this root certificate is not trusted". with the option to

I am using my iMac with OS Sierra 10.12.6

I don't know whether I can trust the server or not or what to do.

I took a screen shot of the first certificate.

I just went back to re-read the certificate, clicked continue and the emails seemed to to. I didn't click "Always Trust" so I don't know what to expect. I spent a lot of time on this message so will send it anyway just in case I have the same problem, or that the outgoing mail didn't actually go. I may need to return. Thanks, Silverfox.

iMac, macOS Sierra (10.12.6)

Posted on Nov 14, 2018 2:53 AM

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Answer 1

ChitlinsCC

Level 7

21,140 points

Nov 14, 2018 7:47 AM in response to MISilverfox

Called TWC.com

They are having an issue with "WebMail" - which also impacts 3rd party Mail clients such as Apple Mail & (mine) Mozilla Thunderbird

Try again later

to see if they have resolved the issue on their end

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Answer 2

ChitlinsCC

Level 7

21,140 points

Nov 14, 2018 7:15 AM in response to MISilverfox

TimeWarner(TWC.com) / Roadrunner(rr.com) aka Spectrum seems to have mucked things up

I tested sending from one RR account to another and got

Sending of the message failed.

An error occurred while sending mail: Unable to establish a secure link with Outgoing server (SMTP) mail.twc.com using STARTTLS since it doesn't advertise that feature. Switch off STARTTLS for that server or contact your service provider.

I will call them in a few minutes and INCLUDE your certificate

FWIW, I have upgraded my Mail client version recently, so that may be an issue (for me at least)

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Answer 3

Nov 14, 2018 8:07 AM in response to ChitlinsCC

Yeah it wasnt just you... but we could login to cfl.rr.com webmail without issue. But still get the message on iPhone and iPad.

Looks to me their mail server has an expired certificate or they introduced a new certificate and they didnt update it properly

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Answer 4

ChitlinsCC

Level 7

21,140 points

Nov 16, 2018 5:48 PM in response to MISilverfox

No problem.

I just tested sending and it did NOT bark at me like before - sent without asking for password as well

I have found that whenever my mail client asks for a password, it is actually having trouble even communicating with the SMTP server (sort of "I dunno what's going on, do you want to try entering your password?")

All of the accounts I have for Roadrunner (TWC/Spectrum) are IMAP -

You could try removing the account > then adding it back again

IMAP folders & messages are all ON the server, with your mail client "representing" what it finds there - so removing and adding back should get you back what you have now in terms of content with a NEW version of the password (same as OLD) stored

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Answer 5

MISilverfox Author

Level 1

63 points

Nov 16, 2018 5:36 PM in response to ChitlinsCC

Thank you ChitlinsCC and donnadave1002 for your responses. I'm embarrassed I have not check back in sooner. My email to the Apple Communities is not in the same area. as the email I use all the time so it doesn't get checked as often and I wasn't expecting this response. My outgoing mail did continue to work and now the only problem I have is the continuous insistence on entering my password which has been going on for months and I cannot seem to stop it.

Thanks again for your responses and your information.

Silverfox

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Answer 6

ChitlinsCC

Level 7

21,140 points

Nov 16, 2018 5:36 PM in response to ChitlinsCC

WebMail worked in testing just now

Thunderbird still barks with above alert

I do NOT have STARTTLS security set

I will wait a while longer and test again

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outgoing mail suddenly cannot be sent due to server verification denial

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