What are some alternatives?
EuropeanMX - Protects your company by blocking spam and virus before they reach your network.
Litmus - litmus tests and tracks your email campaigns, so you can always put your best design forward.
SpamTitan - SpamTitan is an anti-spam email solution specifically developed to meet the demands of modern business. Delivering a spam detection rate over 99.9%
SendInBlue - Innovative online Email Marketing solution to manage your contacts, create & send your newsletters and track your results. More than 80 000 clients. Best prices and attractive features.
Altospam - Antispam and antivirus software on Cloud
Email on Acid - Save time and drive revenue by testing your email before you hit send.