aperturescience.com

Mail between certain domains fails... Hello Reddit! I invite you all to come on this journey of difficult problems with me... My company has two office locations and a domain in each (we'll say ApertureScience.com and BlackMesa.com for now). I had DNS transfers set up between the domains and everything looked like it was working fine. Servers are listed in each other's Name Servers tabs and seem to populate information into the DNS db pretty well. Every few weeks or so, e-mail fails between ApertureScience.com and BlackMesa.com with an undeliverable error [2] In the past I had forced a DNS transfer between DCs and things kicked back to normal within a bit, but now the easy fix isn't working. I have since removed the DNS transferring, forcing e-mail to go out to the web, and it is getting delivered properly this way. Does anyone have any ideas what may be causing my problems? EDIT: *In the example shown, I am sending mail to BlackMesa from Aperture, but e-mail also fails in reverse.* -------------------------------------------------------------------- **[1] - Network Info** * Aperture Primary = SBS 2003, Exchange 2003, DNS, DHCP, etc * Black Mesa Primary (GC) = Server 2008 R2, DNS, DHCP * Black Mesa Secondary (DC) = Server 2003, Exchange 2003 * ApertureScience is set up internally as ApertureScience.local while mail is sent to ApertureScience.com. * ApertureScience and BlackMesa are connected by a Site-to-Site Cisco IPSec VPN Tunnel via two ASA 5510s. * BlackMesa.com's and ApertureScience.com both have external third party spam filters. These are bypassed when the DNS information is transferred (since traffic only has to travel through the VPN). * *Possible but not fully tested:* Accounts at Black Mesa that are set to forward to Aperture Science (ie mine, the boss's, etc) deliver their mail without error. -------------------------------------------------------------------- **[2] - Error Message** Your message did not reach some or all of the intended

Mail between certain domains fails... Hello Reddit! I invite you all to come on this journey of difficult problems with me... My company has two office locations and a domain in each (we'll say ApertureScience.com and BlackMesa.com for now). I had DNS transfers set up between the domains and everything looked like it was working fine. Servers are listed in each other's Name Servers tabs and seem to populate information into the DNS db pretty well. Every few weeks or so, e-mail fails between ApertureScience.com and BlackMesa.com with an undeliverable error [2] In the past I had forced a DNS transfer between DCs and things kicked back to normal within a bit, but now the easy fix isn't working. I have since removed the DNS transferring, forcing e-mail to go out to the web, and it is getting delivered properly this way. Does anyone have any ideas what may be causing my problems? EDIT: *In the example shown, I am sending mail to BlackMesa from Aperture, but e-mail also fails in reverse.* -------------------------------------------------------------------- **[1] - Network Info** * Aperture Primary = SBS 2003, Exchange 2003, DNS, DHCP, etc * Black Mesa Primary (GC) = Server 2008 R2, DNS, DHCP * Black Mesa Secondary (DC) = Server 2003, Exchange 2003 * ApertureScience is set up internally as ApertureScience.local while mail is sent to ApertureScience.com. * ApertureScience and BlackMesa are connected by a Site-to-Site Cisco IPSec VPN Tunnel via two ASA 5510s. * BlackMesa.com's and ApertureScience.com both have external third party spam filters. These are bypassed when the DNS information is transferred (since traffic only has to travel through the VPN). * *Possible but not fully tested:* Accounts at Black Mesa that are set to forward to Aperture Science (ie mine, the boss's, etc) deliver their mail without error. -------------------------------------------------------------------- **[2] - Error Message** Your message did not reach some or all of the intended