After updating passwords, I can no longer send eMails via Outlook

I checked this and had always had Third Party security setting checked.  still not working on my mobile, but OK now on laptop.

@user_SAS - Oh no! Have you tried resetting the password on the Outlook email client you use on your mobile phone?

Hey user_dcotwt and @XfinityDilary ,

I was really hoping this would work for me.  I've had this issue since December 11, 2023.  It has affected two laptops (Win 11) and one android smart phone. 

I shut down everything.  I've got close to 70 devices of one kind or another on my network.  Took a minute :)  It's odd that around 7PM give or take, each day, outbound email just starts working for about an hour or two.  No rhyme or reason.  I wanted to add the following to see if anyone else has the same setup as I do.  Maybe we all are using the same thing (e.g. Netgear ORBI) that might point to something.  I'm at a point, after 20 years of using the same Comcast email address for everything, of having to move to another platform for email.  What a disappointment.

So, here's what I am using:

Windows 11 Pro Laptop

  ESET Smart Security Premium (I've gone through this with a fine toothed comb)

  Malwarebytes Premium

  Microsoft Outlook 2021 client using IMAP (imap.comcast.net (SSL) port 993, smtp.comcast.net (SSL) port 465 require authentication) (switched between 465 and 587)

    I've tried multiple clients on my phone and the issue still exists

  Netgear RBRE960 Router with two satellites (rebuilt this multiple times from factory settings)

  Fiber from local ISP

Samsung Galaxy S21 Ultra 5G Phone

  Samsung's Email app version 6.1.90.16

    I tried a few other apps which all worked EXCEPT for sending email

ESET Mobile Security

  Malwarebytes (Free version)

I've been in IT (retired now) for almost 30 years.  This is right up there with some of the worst issues I've faced.  It's even more difficult when I can't dig into the servers on Comcast's end.  In order for me to actually send an email during the day, I have to turn off wifi on my phone and it sends.  Or, for my laptop, I have to connect to my phone's hotspot...of course, turning off wifi on my phone and connecting to cellular.

Anyway, figured I'd throw that out there hoping for a cure.

Thanks!

Thanks for the update @user_dcotwt. I'm glad to hear the issue has been resolved. If you need anything else, let us know. Have a great rest of your Sunday. 

I'm using Outlook 365 on Windows 11.  I have had intermittent, mostly no connection Pop Up box which asks for server user name and password for three months now.

Today I deleted the comcast account from Outlook.  I logged into xfinity on the web to a) check the password I reset a few weeks ago works and b) verify the allow third-party email connections was still checked under gear settings, security.  I closed Outlook and deleted all the roaming cache files (C:\Users\ME\AppData\Local\Microsoft\Outlook\RoamCache).  I restarted the Outlook 365 app and tried to add back the xfinity email account as IMAP.  I immediately got the recurring popup box and couldn't proceed further.  Nice.....(not).  Made sure the "new" xfinity" email account was deleted in Outlook and closed outlook again, verifying in Task manager that it was completely shut down.  Deleted roaming cache again

REBOOTED ROUTER.  

REBOOTED COMPUTER

No VPN (not that I think that is making any difference nor had it at any time, IMHO)

Opened Outlook, created new xfinity account. that my setting is SSL/TLS and not just plain SSL as indicated in all of Comcasts "helpful" guides.

Double checked IMAP ports. Note that Outlook 365 allows SSL/TLS and not just plain SSL as indicated in all of Comcasts "helpful" guides.

It worked (for now????)

The E

         N

            D??????