MailGet - Super affordable Email marketing via Amazon SES
WiseStamp - WiseStamp allows you to easily create and implement slick and unique email signatures for your business.
Mailzak - Give a boost to your #EmailMarketing
MySignature - MySignature is FREE Email Signature Generator that helps to create Professional Signatures for major email clients such as Outlook, Gmail...
rasa.io - Get more from your email list.
Sigstr - Email signature marketing