What are some alternatives?
Hornetsecurity - Hornetsecurity offers you comprehensive, integrated managed e-mail security services.
Campaigner - Is your email marketing failing to produce the revenue you expect? Learn how to send email campaigns that deliver results with Campaigner. Try our free 30-day trial today.
MailArchiva - MailArchiva is an email archiving, email compliance, and ediscovery enterprise software server.
Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.
MailRoute - MailRoute is a secure, hosted email filtering service that you can have up and running in minutes without any hardware or software to install.
Zoho Campaigns - Zoho Campaigns is an email marketing tool with CRM & social media integration to help you create, send and track effective email campaigns.