Software Alternatives & Reviews

OpenSMTPD VS SMTP

Compare OpenSMTPD VS SMTP and see what are their differences

OpenSMTPD logo OpenSMTPD

OpenSMTPD is a FREE implementation of the server-side SMTP protocol as defined by RFC 5321, with...

SMTP logo SMTP

SMTP provides scalable affordable email infrastructure for all your sending needs.
  • OpenSMTPD Landing page
    Landing page //
    2019-03-05
  • SMTP Landing page
    Landing page //
    2022-09-13

OpenSMTPD videos

DAY[0] Episode #31 - kr00k, GhostCat, and more issues from NordVPN, Samsung, OpenSMTPd

SMTP videos

8 Best SMTP Services for Email Marketing

More videos:

  • Review - What is SMTP? and how it works? the Simple Mail Transfer Protocol Explained in 3 Minutes
  • Review - Introduction to SMTP Relay for Servers

Category Popularity

0-100% (relative to OpenSMTPD and SMTP)
SMTP Server
100 100%
0% 0
Email Marketing
0 0%
100% 100
Email
100 100%
0% 0
Email Delivery
12 12%
88% 88

User comments

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Reviews

These are some of the external sources and on-site user reviews we've used to compare OpenSMTPD and SMTP

OpenSMTPD Reviews

Best Free and Open Source Alternatives to Microsoft Exchange Server
OpenSMTPD is an implementation of the server-side SMTP protocol, with some additional standard extensions. Its design goals include security, reliability, ease of configuration, and support for common use cases.

SMTP Reviews

We have no reviews of SMTP yet.
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Social recommendations and mentions

Based on our record, SMTP should be more popular than OpenSMTPD. It has been mentiond 5 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

OpenSMTPD mentions (2)

  • Has anyone setup a Linux based internal only smtp relay?
    I've had something of the same experience with Postfix, u/0x29aNull. Check out OpenSMTPD. It is lightweight and standards compliant. I know that there are packages for Debian and Alpine Linux. There may also be ones for Fedora/RHEL derivatives. I use it in my environment on OpenBSD. Source: about 1 year ago
  • DKIM Migration: Rpamd instead of DKIMproxy out on OpenBSD / OpenSMTPD
    When I installed Rspamd with on OpenBSD / OpenSMTPD the other day, DKIMProxy out (dkimproxy_out daemon), which had been got via OpenBSD Ports package system, was used to add DKIM signatures to mails in order to improve security on emails. - Source: dev.to / almost 3 years ago

SMTP mentions (5)

  • SMTP provider without sending\hourly limitation?
    I will confront it with smtp2go, they look very similar, also in terms of cost smtp.com is 10$ more, but we'll see which one suits us better. Thanks for the suggestion! Source: about 1 year ago
  • Cold Email Software
    Phplist is free, then you will need to plug that into an SMTP relay like smtp.com or sendgrid.com. Source: almost 2 years ago
  • Google workspace vs dedicated IP SMPT
    Let's say I need about 3k emails per day. Is it better to create 3 domains with google workspace or create smpt server and dedicated IP with AWS SES or smtp.com ? Source: over 2 years ago
  • The hell did this user do? They have corp gmail.
    We push customers to smtp.com or mailjet. Mostly because we can pull data from their respective API's directly into our software. Source: over 2 years ago
  • ProtonBridge, SMTP and Symfony
    Don't abuse ProtonMail for spamming. If you want to spam folks, use dedicated spam services - such as sendgrid, mailjet, smtp.com, Sendinblue, etc, etc. There's a ton of these services who does the spamming in the proper ways. Source: about 3 years ago

What are some alternatives?

When comparing OpenSMTPD and SMTP, you can also consider the following products

Postfix - Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.

Mandrill - Mandrill is a new way for apps to send transactional email. It runs on the delivery infrastructure that powers MailChimp.

sSMTP - sSMTP is a simple MTA to deliver mail from a computer to a mail server.

turboSMTP - turboSMTP is a reliable, powerful, easy-to-use SMTP server that maximizes the deliverability of all...

Exim - Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.

Postmark - Postmark is the easiest and most reliable way to be sure your important transactional emails get to the inbox. Simply & reliably parse recieved email to JSON for your webapp.