Gmail Mail Merge - Send personalized emails with attachments
Posteo - Web- and IMAP-based email service. 2GB cost 1€/month.
Dynamic Campaigns by Sigstr - Share the most relevant content in every email
Inbox.lv - Inbox.lv Mail
Dynamically Personalized Emails by QGraph - Hyper-personalized emails for E-commerce
CounterMail - Countermail is a web-based email service. It is hosted in Sweden. Its focus is on privacy.