Take a look at Preferences | Tweaks and look for SMTP
Quote:
ID: public_smtp_relay_delay
The number of seconds to wait before sending emails when using a
public email server like gmail or hotmail. Default is: 5 minutes
Setting it to lower may cause the server's SPAM controls to kick in,
making email sending fail. Changes will take effect only after a restart of
calibre.
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Code:
# The number of seconds to wait before sending emails
public_smtp_relay_delay = 301