Hi All.
I hope someone could assist me as I have been struggling with mail flow issues for a long time.
We have our own in house exchange server and internal mail as well as incoming mail is 100 %.
We have always used our ISP smart host to send email and started getting email flow issues a couple of months ago.
I then switched over to sending email via DNS. I setup the correct DNS records eg Reverse Lookup record and SPF records as i thought this might be an issue. I have also cleared our domain off one or 2 blacklists. (We had a user account compramised and spammers were using that account to send email)
This is now all cleared up and general outbound email flow is going great, but once again we are now experiencing issues with all clients filtering with Mail Marshall.. Message as below:
Your message did not reach some or all of the intended recipients.
Subject: Email
Sent:2014/09/16 09:02 AM
The following recipient(s) cannot be reached:
example@example.co.za on 2014/09/16 09:02 AM
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<example.example.org.za #5.5.0 smtp;550 Message refused by MailMarshal SpamProfiler>
Has anyone got any advice on what I can do. The failed report doesnt give much help. I have also sent an email with just text to see if maybe its the email signature but still no luck.
I'm thinking of switching back to the ISP as a smart host but I'm not sure if the SPF and reverse DNS records would cause an issue now.
Would our clients not look at the reverse and SPF record and see that the IP (ISP Smarthost) doesn't match our IP lised in the public DNS ?
Much Appreciated.
Shaun