Getting errors when sending e-mails

So i'm getting these errors while sending some e-mails, is it something wrong on my end?

554 5.4.14 Hop count exceeded - possible mail loop ATTR34 [CY1NAM02FT028.eop-nam02.prod.protection.outlook.com]

DSN generated by:	RO1PR80MB3611.lamprd80.prod.outlook.com
Remote server:	CY1NAM02FT028.mail.protection.outlook.com

This one too:

Reason: 550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [DB5EUR01FT032.eop-EUR01.prod.protection.outlook.com]

And this:

Diagnostic information for administrators:

Generating server: NA2EX04.PVHCORP.COM

Remote Server returned '550 5.1.10 RESOLVER.ADR.RecipientNotFound; Recipient not found by SMTP address lookup'