Simple TLS/SSL supported SMTP client for Qt5

MichelSM

hello I used this same project in linux and it worked perfectly

but when I needed to use it on windows I had this error:

@
Starting C:\Users\eng-IEK\Desktop\smtp_multiple_files\build-smtp-Desktop_Qt_5_2_0_MSVC2012_64bit-Debug\debug\smtp.exe...
No attachments found
stateChanged QAbstractSocket::HostLookupState
stateChanged QAbstractSocket::ConnectingState
stateChanged QAbstractSocket::ConnectedState
QSslSocket: cannot call unresolved function SSLv23_client_method
QSslSocket: cannot call unresolved function SSL_CTX_new
QSslSocket: cannot call unresolved function SSL_library_init
QSslSocket: cannot call unresolved function ERR_get_error
error QAbstractSocket::SocketError( 21 )
QSslSocket: cannot call unresolved function ERR_get_error
error QAbstractSocket::SocketError( 20 )
Connected
C:\Users\eng-IEK\Desktop\smtp_multiple_files\build-smtp-Desktop_Qt_5_2_0_MSVC2012_64bit-Debug\debug\smtp.exe exited with code 0
@

anyone have any idea what it might be? maybe some lib?

SGaist

Did you install and openssl on your window machine ? Is your Qt built with SSL support ?

MichelSM

I installed OpenSSL and tried again and could not anyway
how do I find out if my Qt is with support for SSL?

ALL on linux is easier kkkk

SGaist

First thing, check that you install OpenSSL 64bit to match your Qt architecture.

Then check that your PATH variable contains the folder of the OpenSSL libs

MichelSM

thanks for the help
i have installed the 32bits version, and this don't work

now whit the 64bits this worked

yyang2000

Hi all,

I am working on application using Qt4.84 and the target system is linux LTIB BSP. I want the target system can send out an email to external someone or some kind of mail box via the wifi network or wireless 3G/4G modem. I wonder if this SMTP client can solve my requirement? Since you are using Qt5, is it a problem for me to use Qt4.8.4? If you have any suggestion for the Qt4.8.4 platform, please let me know.

Thanks,
Bill

gowikel

Thanks, I was looking for a tutorial for do a small application than send some emails when I found this.

Thanks a lot

plinioandrade

CONGRATULATIONS TO "This Guy!!!":http://morf.lv
He developed the most simple and useful Qt 5 compatible SMTP Client.

fab_

Hello everyone.
The last post is kinda long ago so I'm hoping the someone will read this:

I have an application which is required to send emails. So I setup a local mailserver and pulled bluetiger9's code here:

https://github.com/bluetiger9/SmtpClient-for-Qt

I was able to build a shared .dll file in release Mode. Its 120kb in size.

Could someone kindly help me out now on how I can use this dll in my application?
Lets say i want to use it in my application in debug Mode. It looks like it isnt enough to put the .dll file in the corresponding folder. Im not sure what extra info to include about what I've done. Please let me know

SGaist

Hi and welcome to devnet,

Do you mean compile your application to use that library or use it when deploying your application ?

fab_

Hello!

It's both I guess.
I want to use the functions that lib gives me in my code for my application.

When i deploy the application i usually have to provide all neccessary dll files in the same folder (libmysql.dll) for example. So no static linking if thats what you're referring to.

If you look at the github page of my first post. There is an example of its usage right on the front page. I'm trying to achieve to get this example to run properly.
https://github.com/bluetiger9/SmtpClient-for-Qt

After I made my first post I spent the rest of the night tinkering with it and I managed to get something going:

Following this;
https://wiki.qt.io/How_to_create_a_library_with_Qt_and_use_it_in_an_application
I saw that MinGW (I use MinGW)creates a .dll and a .a file. I copied both those files in the folder containing the project where there supposed to be used. I also copied the header files in the same folder.

Here is my .pro file:

QT       += core
QT       -= gui

TARGET = SMTPEmailTestDLL
CONFIG   += console
CONFIG   -= app_bundle

TEMPLATE = app

win32:CONFIG (release, debug|release): LIBS += -L$$PWD/ -lSMTPEmail
else:win32:CONFIG (debug, debug|release): LIBS += -L$$PWD/ -lSMTPEMail
else:unix: LIBS += -L$$PWD/ -lSMTPEmail

INCLUDEPATH += $$PWD/
DEPENDPATH += $$PWD/

SOURCES += main.cpp

This actually enabled me to build and run the programm as seen on bluetiger9's github front page.

But, upon running it either terminates with return value -1073741515 or I get the message that "The process to debug couldnt be adressed: wrong parameter"

Weirdly, although receiving those messages, the programm sometimes actually sends an Email out to my gmail Account (be it with a wrong timestamp) as intended, but sometimes it just doenst.

So I might've done something wrong on the way.
I'm sorry if the information I'm giving is somewhat blurry. I appreciate you taking some time for this SGaist!

fab_

Nevermind, I got it fixed. Turns out you shouldnt rename the dll file after building it. Its name should be the same as specified in TARGET

DoctorD

I am using this with Qt 5.7. The email is successfuly sent but then I get this error in the end :

Server response code: "221"
Server response: "221 2.0.0 closing connection y144sm8277194wmd.18 - gsmtp\r\n"
error QAbstractSocket::RemoteHostClosedError
stateChanged QAbstractSocket::UnconnectedState
disconneted
error "The TLS/SSL connection has been closed"

MRen

Hi, good one !

Thanks for sharing !

nateliv

This post is deleted!

SGaist

Did you check whether your server uses an outdated protocol that is either not supported anymore or disabled by default for security reasons.

Nyrenthia

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sanshow

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work

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opengpu

@SGaist does the Qt-installer with SSL? i donot want to compile Qt by myself