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Postfix on Fedora works nicely<br />
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Exchange Server does the job especially if you are using Outlook clients<br />
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Febooti is a good command line smtp program
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Postfix on Fedora works nicely

Exchange Server does the job especially if you are using Outlook clients

Febooti is a good command line smtp program

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Looking for recommendations for SMTP services or is it better to run our own SMTP server? We have tried SendGrid and DynECT, but have had suppression and time delay problems with both. Our system currently sends 15,000+ emails a day and the number is only growing everyday. &nbsp;Our product depends on emails being delivered and in a timely manner.
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Looking for recommendations for SMTP services or is it better to run our own SMTP server? We have tried SendGrid and DynECT, but have had suppression and time delay problems with both. Our system currently sends 15,000+ emails a day and the number is only growing everyday.  Our product depends on emails being delivered and in a timely manner.

SMTP Server VS SMTP Service

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

An email client, email reader or more formally mail user agent (MUA) is a computer program used to access and manage a user's email. A web application that provides message management, composition, and reception functions is sometimes also considered an email client, but more commonly referred to as webmail.