MailGet

https://www.formget.com/mailget-app/

+ cheap
+ connect to Amazon SES
+ tracks clicks and opens
+ delivers emails on preset schedules (don't know if it reads emails and tags replies)

- can't see any analytics

Woodpecker

https://woodpecker.co/

+ connect to any imap
+ reads emails and can change cadance
+ reads emails and decides positive or not
+ looks like has some basic stats

- does not seem to connect to Amazon SES or SendGrid

lemlist

https://lemlist.com/pricing.html

+ personalization through images
+ unlimited campaigns
+ freshdesk uses it for outbound
+ follow up sequences, with reading of emails
+ personalize before sending
+ own smtp
+A/B split test
+ send email on behalf of someone else

SmartReach

https://smartreach.io/pricing

+ cadance stops on replies
+ connect any SMTP
+ personalize emails
+ TimeWarp - reach email in their timezone
+ A/B tests
+ campaign stats
+ warm up - slowly increase volume of emails

https://www.saleshandy.com/automatic-follow-up-emails/

+send from own smtp
+ email auto follow up
+ stats and reporting
+ same thread reply  (auto-pause on reply?)
+ outlook extension

- no clue if it will auto-pause follow up on reply

- no individual customization possible
- cant add individual emails

https://quickmail.io/pricing

+ custom smtp
+ Detects Out of Office, Bounces and Calendar invites.
+ auto-pause campaign progress
+ Protection from importing duplicate Prospects.
+Protection from sending duplicate messages to the same Prospect.

- no image proof of analytics
- most expensive of the options