Because soon those email services just won't let you
- and for good reason.
To prevent address spoofing by spammers, some of the major webmail services (including Gmail, Yahoo and AOL) will reject
and bounce back any email with a "From" address of theirs which isn't being sent by themselves.
This is why you shouldn't use Gmail, Yahoo or AOL senders in E-goi, as soon virtually none of your emails won't be delivered
! We've blogged further about this
Yahoo-centric post, but Gmail and AOL do pretty much the same thing).
Try to use an address hosted in your own domain
instead (eg. email@example.com and not firstname.lastname@example.org). A registered domain is
not only suited for email marketing
but can also be manually
set up for the highest possible deliverability