Strange email address in list

[Dangerous2a]

If I send an email to my home email account from another talktalk account on my PC, as soon as I type the intial letter I get the correct address but also the correct email plus a string of hex numbers and "guest" as here:  myhomemail@talktalk.net<f1ee01d769214397843ad9388af92f_Guest_de725>

Is this an attempt to grab my details? I have had loads of spam/scam emails lately.

I use MS Outlook 2019 on these accounts.

I only noticed this strange behaviour from today after sending a mail from my gmail account.

It does not happen from myothername@yahoo.co.uk or myname132@gmail.com

Is this something that is lodged within this PC? I cannot copy it or find it in the address list.

My laptop seems to be fine.

Any ideas?

[Ady-TalkTalk]

It will have been Outlook. The TalkTalk servers have nothing to do with what you're typing until the mail is sent. 

Ady

[Dangerous2a]

Hi, Thanks for your prompt reply.

FYI: Yesterday I ran Malware Bytes and Windows defender which found nothing but the odd address was still there.

Usually the link in the list is in the form of MY NAME <txaddress@talktalk.net> This odd one is txaddress@talktalk.net******************* etc.

If I click on the cross at the side of the list of addresses starting with "t" it vanishes from the addresses bar and I can select my correct main address with no hex strings. So I just tried again  and the txaddress@talktalk.net + the odd suffix has vanished completely. It was only on this PC and only between talktalk and my main account  including ones to self from main.

I just did a restart of Outlook and it has stayed gone. Strange. It was persistent all day yesterday.

I have now re-started the PC and it has not returned.  Very Odd!

 I have no idea if this was an Outook issue or Talktalk.

[Ady-TalkTalk]

Hi Dangerous2a, what happens if you delete the email address and retype it? 

Ady