Need RCPT command error

[mrf3049]

My internet connection is fine and I can receive emails with TalkTalk webmail  but I cannot send or reply to received emails. I get a '503 5.5.1 Error need RCPT command'  and if I try again a '503 5.7.1 Reject for policy reason'  I have now spent nearly 3 hours with help and support trying things but the problem remains. I'm exhausted and wonder does anyone know where this problem may suddenly have appeared from  and has anyone had this problem and had it resolved ?  Technical support appear to be floundering  and I'm insufficiently adept with systems to know what I'm doing if I make adjustments.  

[Mandisa-TT]

Thank you so much for letting us know, is there anything else we can assist you with?

[mrf3049]

Fault has been corrected - email working as it should this morning 

Thank you to whoever has done this

[Mandisa-TT]

Thank you so much @Gliwmaeden2 for your support.

[Gliwmaeden2]

It sometimes seems to happen if the server misinterprets what you are trying to send as Spam, @mrf3049.

The forum search engine will take you to threads on this topic - select the "forums" option or you won't get many answers. I typed in the number of the error message to see what came up. 

Unfortunately staff are not back on here to offer support before Monday, @mrf3049.