We're sending out 1000's of mails per day from our site (mainly "
click here to verify your subscription") and too many are getting flagged by spam (mainly hotmail). One of the things I noticed in the headers is
X-Authentication-Warning: srv01.site.com: www-data set sender to
[email protected] using -f
Is this something I should be worried about, that may cause spam flags to raise?
(I'm already checking various issues that have been mentioned regarding spam flagging over at stackoverflow, I know there are many factors in play)