Can someone shed some light on this.
I think it's something to do with DNS and Authentication or perhaps even a Self Sign Cert for Exchange.
Do we need to prove it is us sending the email with confirmation the IP belongs to this exchange server.
All .gov.uk emails are doing this. On the whole, the rest seem to go through just fine.
The only obvious thing here is our local domain is being sent via the Email Headers along with the original internal IP Address.Code:From: THEMAN@tendringdc.gov.uk Sent: Wednesday, October 4, 2017 2:46 PM To: OUR EMAIL Subject: Undeliverable: WHAT WE ARE TALKING ABOUT mail.tendringdc.gov.uk rejected your message to the following e-mail addresses: THE MAN (THEMAN@tendringdc.gov.uk)<[Only registered and activated users can see links. ]
Would this make it fail because "TrustManager" doesn't like it?
Is a Self Signed Certificate needed somewhere?
Do I need to put some sort of 'this IP belongs to this domain/email address' on sending each email?
Only had this pain in the arse since transferring to Virginmedia's new awesome super dooper Business account that CANNOT offer a fixed IP Address at the moment and we've had to implement Dynamic.
Fucking one headache after another with this shit! Including requesting the Dynamic IP Address to be lifted from 14 Blacklists!! FFS!