A couple years ago, I looked at switching from an in-house email server to an ESP -- MailChimp being one. Right as I was performing the cost-benefit, two things happened:
1. Gmail started re-hosting email images, nullifying passive email-open
detection features even if the user ALLOWED images.[1]
2. MailChimps added language around distribution caps.
As a minor dealbreaker, ESP's force mandatory unsubscribe links for CAN-SPAM compliance, no matter how small/private your list becomes.
A couple years ago, I looked at switching from an in-house email server to an ESP -- MailChimp being one. Right as I was performing the cost-benefit, two things happened:
As a minor dealbreaker, ESP's force mandatory unsubscribe links for CAN-SPAM compliance, no matter how small/private your list becomes.[1] http://arstechnica.com/information-technology/2013/12/gmail-...