Go Premium for a chance to win a PS4. Enter to Win


SMTP component for delphi that is absolutely free.

Posted on 2006-11-05
Medium Priority
Last Modified: 2010-05-18

I was wondering where can we get a SMTP component that is absolutely free. I used the Built in SMPT component in Delphi 6 but it returned an error. saying "invalid command sequence".
Question by:aerokevs

Accepted Solution

ewilde earned 336 total points
ID: 17878898
in delphi 6 you probably used Indy components, right?
well, generally, i had very good experience with these components. i believe there is a solution to your problem, though you need to supply more details..

generally speaking, i would recommand to download the latest version of Indy (version 10). it's an open-source project.


LVL 22

Assisted Solution

by:Mohammed Nasman
Mohammed Nasman earned 332 total points
ID: 17880243
LVL 17

Expert Comment

ID: 17885108
personal preference would be the Indy components for SMTP,
although for almost anything else, I'd use Francois Piette's ICS (internet component suite)
Concerto's Cloud Advisory Services

Want to avoid the missteps to gaining all the benefits of the cloud? Learn more about the different assessment options from our Cloud Advisory team.


Author Comment

ID: 17886258
using the indy component i encountered and error saying "invalid command sequence" and "we do not relay <email address>';
LVL 17

Assisted Solution

TheRealLoki earned 332 total points
ID: 17886469
you'd likely get those problems no matter what component you used then
"invalid command sequence" means just what it says, you have sent a command in the wrong order, or the server was expecting a command before the data you sent.

the "we do not relay" is a common occurrence with ISP's these days. In an attempt to reduce the number of spammers using them as launching pads, they either only allow smtp from trusted sites (other mail servers), or require an authorization first.
try smtp to your local isp's mail server and you wont have this problem.

Author Comment

ID: 17887212

what do you mean by try smtp to your local isp's mail server?

LVL 17

Expert Comment

ID: 17893063
Let's say you connect to the internet with "SpeedyNet.com" and they have their mail server as
"smtp.SpeedyNet.com" port 25
Your friend connects to the internet with "MegaNet.com" and they have their mail server as
"smtp.megaNet.com" port 25

If you want to send an email from "MyMachine" to "MyFriend's email address"
the *nomal* travel would look like this
[Mymachine] smtp mail to smtp.Speedynet.com port 25
[smtp.Speedynet.com] Recives mail, sees it is for ...@MegaNet.com, and queues for delivery
[smtp.Speedynet.com] sends mail to MegaNet.com port 25
[MegaNet.com] Recives mail, sees it is for itself (...@MegaNet.com), and puts it in "myfriends" email mailbox.
[MyFriend] connects to pop3.MegaNet.com port 110 and downloads his mail
[MyFriend] sees it is an offer for a free diploma, and marks it as junk mail...

If you were to try to send to smtp.SomeOtherServer.com port 25, and have *that* server send the mail to MegaNet.com, you would likely get the "we do not relay" error
This is because the smtp mail servers are checking your ip address against their list.
They typically allow any ip address that is issued by themselves (ISP), and other known mail servers, but deny others.

so... if you set
IdSMTP1.Host := 'smtp.MyISP.com'; // eg. 'smtp.Speedynet.com';
then your ISP's mail server is unlikely to reject it.

Author Comment

ID: 17896335
so what should i do in order that my mail will go smooth? Acutally i am using an ip address instead of the name.

Author Comment

ID: 18186110
guess i have to request for a refund.. no further answers were added.
LVL 17

Expert Comment

ID: 18186708
well... the correct answer to your question "where can we get a SMTP component that is absolutely free."
was answered by ewilde and mnasman in the first 2 answers.
That error has something to do with the server you are connecting to, and how you are connecting to it, so that is your real problem.

Expert Comment

ID: 21133085
Forced accept.

EE Admin

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In this tutorial I will show you how to use the Windows Speech API in Delphi. I will only cover basic functions such as text to speech and controlling the speed of the speech. SAPI Installation First you need to install the SAPI type library, th…
Have you ever had your Delphi form/application just hanging while waiting for data to load? This is the article to read if you want to learn some things about adding threads for data loading in the background. First, I'll setup a general applica…
Is your data getting by on basic protection measures? In today’s climate of debilitating malware and ransomware—like WannaCry—that may not be enough. You need to establish more than basics, like a recovery plan that protects both data and endpoints.…
Despite its rising prevalence in the business world, "the cloud" is still misunderstood. Some companies still believe common misconceptions about lack of security in cloud solutions and many misuses of cloud storage options still occur every day. …
Suggested Courses

886 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question