Neither CloudSMTPServer nor Kingmailer offers a free trial.
CloudSMTPServer is designed for Large Enterprises, Medium Business and Small Business.
Kingmailer is designed for Large Enterprises, Medium Business and Small Business.
The starting price of CloudSMTPServer begins at $1,000/Month, while pricing details for Kingmailer are unavailable.
Some top alternatives to CloudSMTPServer includes SMTP2GO, JangoSMTP, SocketLabs, SMTP, Kingmailer, Mailrelay, Mailercloud, Qualified, Workvivo, InitSky Bulk Email Server, Jetsend and IFTTT.
Some top alternatives to Kingmailer includes SMTP, Campaigner and Moosend.