QK SMTP Server can work with most mail clients, such as Outlook Express, Eudora, IncrediMail, the Bat!, Mutt, KMail, Pegasus, DevMail, Mail Bomber, Delta Mail, Foxmail, and so on; it can also work with most bulkmail software, let mail clients send newsletters faster.

You can send mails directly from your own computer via QK SMTP Server instead of waiting for connecting and applying with your ISP's SMTP server. By setting send thread (1~100), you can complete 500~2000 mails in one minute.

A: Send directly to recipients' mail boxes;
(In this mode, all emails will arrive destination mail box with an instant feedback.)
B: Send via a transit SMTP Server;(In this mode, all emails are relayed to your ISP's SMTP Server.)
C: Send directly first; if it failed, relay to transit SMTP Server.(Emails will be relayed to your ISP's SMTP Server if the first attempt to send directly fails.)

You also can get correct and instant feedback from the recipients' mail server when sending mails at a high speed via QK SMTP Server.

QK SMTP Server supports SMTP Authentication before sending emails. Therefore you can kick off those anonymous users who are going to abuse your computer.

QK SMTP Server can work with most mail clients, such as Outlook Express, Eudora, IncrediMail, the Bat!, Mutt, KMail, Pegasus, DevMail, Mail Bomber, Delta Mail, Foxmail, and so on; it can also work with most bulkmail software, let mail clients send newsletters faster.