Hi, I have exchange 2010 environment contain 2 mailboxes and 2 hub cas servers and we have more than SMTP addresses used by users like (Abc.com , 123.com, example.com etc) the issue is I need to configure the FQDN in the send connector to avoid Hello errors but I dont know which domain name should I put in that field as I have many domain names as I mentioned above also I dont want to use smart host I should use my hub cas servers to deliver emails to outside so is there is any solution to add multiple domain names in the FQDN field in the send connecter or I should ask all my customers to add me in there whitelist

The FQDN needs to simply match a valid ( and with a PTR) in DNS that recipient servers can resolve. So, if you set it to mail.abc.com, then mail.abc.com should resolve in DNS and have an associated Reverse Record as well. Think of this way. Mail Hosting companies support thousands or more SMTP address spaces. They dont create a unique FQDN connector for each. You should also create SPF records for all your SMTP domains -

Hi, Thanks for your reply I already have PTR and SPF record for all domains in my ISP DNS but I receive some callas from customers that block our mails because of Hello name mismatch

Hi, Thanks for your reply I already have PTR and SPF record for all domains in my ISP DNS but I receive some callas from customers that block our mails because of Hello name mismatch What specfically are they referring to? What is the exact NDR senders get?

Hi Sameh, This part concerns me a little: I already have PTR and SPF record for all domains If you're using one server to send on behalf of multiple domains, then you ought to have just the one PTR record (not multiple as the phrase implies), which should resolve to the A record of the hostname configured within the send connector properties. The MX records for each sending domain should then point back to this A record. The SPF definition should then authorise that host (both the IP and the hostname) as a legitimate sender for those additional domains (i.e. it should appear in the SPF definition for each domain. Using your examples above of abc.com and 123.com, you'd have two separate TXT records that look something like the following: For abc.com: v=spf1 mx:mail.yourdomain.com ip4:205.10.11.12 ~allFor 123.com: v=spf1 mx:mail.yourdomain.com ip4:205.10.11.12 ~all Again, these are only examples, but they illustrate the fact that the SPF record is the same across all the domains and that the hostname you use in the "mx:" directive is configured to match whatever the hostname in your send connector's properties is. You do not need to have the domain of your send connector match the domain of the sent e-mail. It feels like perhaps this is where you're getting a little confused. Cheers, Lain