I want to send 1,000 emails to 1,000 address using Thunderbird. The emails are generated using a Windows MAPI.
When these mails and rendered, it will send immediately. Rendering 1,000 mails takes less than 1 minute and it will send to ISP’s SMTP server immediately. The SMTP server will treat this as spamming activity.
If I may slow down the sending rate to about 50 mails a minute, then these emails will all get through.
I couldn’t find any option or add-on in Thunderbird to limit the sending rate? Do you have any ideas?