Not receiving emails from certain sender

[LostEmail]

Hi

Im also getting the same error for my son's talktalk email. 

Seems he can send me emails no problems, but no emials are getting through to him on either Outlook or webmail app. 

Whats the fix? A

[Gondola]

---

@LostEmail wrote:..."no emials are getting through to him on either Outlook or webmail app. 

Is your son's TalkTalk mailbox not seeing any new mail messages arrive in the Inbox? Your topic title suggests "certain sender" only - or is that your emails to him are being rejected? If the latter then what's the error message and TT code accompanying the bounceback delivery failure message?