How to reduce request processing time for mail sender

[hidden garnet]

Using java mail sender to send mails like otp for email verification, password reset and welcome message (new registrations). But it is taking too much time sometimes even >10 sec which i dont is very optimal as my average query takes < 2-3 sec.

How do i reduce this time

[devout bloom]

<@&1004656351647117403> please have a look, thanks.

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TJ-Bot

Using java mail sender to send mails like otp for email verification, password reset and welcome message (new registrations). But it is taking too much time sometimes even >10 sec which i dont is very optimal as my average query takes < 2-3 sec. How do i

To reduce the request processing time for sending emails with JavaMailSender, focus on optimizing asynchronous behavior and resource management:

• Send emails asynchronously: Avoid blocking the main request thread. Use Spring’s @Async annotation or schedule email sending via a separate thread/executor service. This prevents the user from waiting while the mail is sent.
• Connection reuse: Set up a JavaMailSender with connection pooling or reuse by configuring the mail session properties like mail.smtp.connectiontimeout, mail.smtp.timeout, and mail.smtp.writetimeout, or use libraries that support pooling.
• Use SMTP server efficiently: Confirm your SMTP server performance isn't the bottleneck. Sometimes third-party SMTP providers can be slow; choosing one with low latency or third-party transactional email services (like SendGrid, Amazon SES) improves speed.
• Optimize mail content: Keep email content minimal or use templates to reduce processing time.
• Avoid heavy attachments: Large attachments delay sending.

Usually, the significant gain comes by making email sending asynchronous, so the API returns immediately while email processing happens in the background.

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Useful links:

• Spring Boot Async Email Sending Guide (Baeldung)
• JavaMail API Performance Tuning
• Spring Async Methods Documentation

- AI generated response using gpt-4.1-mini model

[thorn dust]

its probably the foreign mail server finding u sus and throttling it

mails send by some odd domain without a proper ssl cert etc arent thrusted

[tired stump]

As zabu said, it'll be the mail server itself and not java mail sender - that's typically pretty quick

[weak swift]

mail servers are slow to discourage spam

[hidden garnet]

so what could be the fix for it

[weak swift]

there isn't one

accept a 10 minute delay

[hidden garnet]

wtf

[weak swift]

oh 10 sec

thats more reasonable

but yeah just accept it

it might be best to send emails asynchronously

[hidden garnet]

i dont think other app take 10 sec to send a mail, or do they

[weak swift]

it depends on what domain they are sending from

and you wouldn't notice 10 sec

[hidden garnet]

like complete request while still in process of sending mail

[weak swift]

yeah - so insert a row into the db that a background task will pick up and send the email

[hidden garnet]

hm k

seems like i have to learn a new concept for that

[weak swift]

that has some other pros

like you can retry

or know which ones failed to send (if you track)

[hidden garnet]

hm

[weak swift]

we used to use sendgrid at my last company

it made a lot of this easier

but obv. costs money

[hidden garnet]

k not going to implement it right now, but will work on that in version 2

thanks for the info