Message Peeping Tom - Message Peeping Tom is an app by HSTAR, offers features that let you read your messages without giving the read report to the sender.
Posteo - Web- and IMAP-based email service. 2GB cost 1€/month.
Seecrypt - Seecrypt app allows users to do secure voice and conference calls by using advanced encryption features so they can contact their friends, colleagues, and family members without any privacy issues.
Inbox.lv - Inbox.lv Mail
SMS Plus - SMS Plus app offers features that let you forward text messages through internet connection as well as through other social media platforms.
MeMail.com - The ultimate email service for personal, professional and business use. Unique Email Addresses