Is there a way to whitelist approved sender locally? without touching DNS?
My ISP is optimum online, I have a webserver (slackware-sendmail) and mailserver (centos+qmail_toaster). Since my ip is dynamic I am on the list where I am not able to send e-mail's directly (forgot the name). Instead I am using my ISP's relay on both webserver and mailserver. Problem is my ISP has multiple mx, so putting them all in my DNS SPF one by one is troublesome.
Also, if i had to use my qmail_toaster as the relay for my webserver, will it accept my e-mails without being blocked by SPF?
