Overview
What is SMTP Preprocessor?
Enhances functionality of corporate mail server. Receives SMTP messages before it, on-the-fly changes or rejects them, and retransmits result to the server. Supports wide range of settings and keeps adjustable log.
In depth
A closer look at SMTP Preprocessor
SMTP Preprocessor is advanced tool for mail administrators. It enhances functionality of corporate mail server. The program receives SMTP messages before corporate SMTP server, on-the-fly changes or rejects them, and retransmits result to the server. Wide range of settings allows to improve security and add new features to corporate SMTP server. SMTP Preprocessor can reject connection based on remote host IP address or DNS name (Black List), presence of reverse DNS PTR record, validity of HELO or EHLO command and connections limit; reject MAIL command based on sender address (Black List), transactions limit and message size; reject RCPT command based on recipient address (Private Recipients List), recipient domain name (Anti-Relaying), sender address (Restricted Senders List) and recipients limit; reject out-of-order SMTP command; flexibly replace corporate SMTP server response or any SMTP Preprocessor generated response; replace sender in SMTP envelope (MAIL command); replace recipient in SMTP envelope (RCPT command). The program keeps adjustable detailed log of all SMTP events.
Requirements
System requirements
VB6 Runtime library, permanent Internet connection, SMTP server software
Verdict
Should you download SMTP Preprocessor?
SMTP Preprocessor runs on
9x/NT/2000/ME/XP/Windows 10/11
and is available under the
Freeware
license
— the installer is 137 KB.
We’ve catalogued it under
Internet and Networking.
✓
Verified clean. Every SMTP Preprocessor build on SoftLookup is scanned for viruses, spyware, adware, trojans and backdoors. We re-test on every update.
Sponsored
At a glance
SMTP Preprocessor specifications
- Last updated
- Mar 12, 2025
- Requirements
- VB6 Runtime library, permanent Internet connection, SMTP server software
- License
- Freeware
- Operating system
- 9x/NT/2000/ME/XP/Windows 10/11
- File size
- 137 KB
- Price
- Free
- Page views
- 418
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