It takes atleast 10 seconds to login to office 365 smtp and imap using email component

Question

I am trying to create an email client using Mail.dll for multiple Smtp and Imap providers. Gmail takes about 2 seconds atleast to login to its Smtp and Imap server which I already assume is slow.

I am trying to setup smtp.office365.com on port 587 by setting StartTLS to true.
But the logging into Office365 servers is way slower and takes atleast 10 to 20 seconds.

I am sure there is no issue with my internet connection.
Is there anything i can do to accelerate the login process?
I hope to get a solution that works effectively(with gmail and other smtp/imap servers too).

Thanks.

Answer 1

I don't think this is Mail.dll problem, especially if Gmail is several times faster.

On my machine (located in Europe) whole sequence:

• Connect using SSL/TLS,
• Login,
• Close and disconnect

takes 1.3 - 2.1 seconds for Gmail,
and 1.5 - 2.8 seconds for Outlook.com.
and 1.6 - 2.8 seconds for Office365 (pod51009).

My question is what takes most time: ConnectSSL or UseBestLogin?

There is also a good chance that email provider is slowing you down on purpose (you send too many emails for example).

Comments

ConnectSSL takes about a second.
Its UseBestLogin which is taking so much time.
I tried using just the Login method. It takes same amount of time still. Also I do not send too many emails either.

Thank you for the response.

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When SSL is on UseBestLogin performs same IMAP command sequence that Login does.

Both don't download anything from the server.

My opinion is you should prepare a log (each entry has time noted): https://www.limilabs.com/blog/logging-in-mail-dll and contact Office365 support.