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The SMTP protocol has re-delivery intervals of 5 days :) What are a few seconds?
If you send a lot of letters from this mail, send first to those recipients who are more important to you, and then to the rest (so that dozens of letters do not go at a time). Gmail allows you to send letters to up to 500 recipients per day. The delay in delivery may be due to a heavy attachment to the letter (presentation, photos), in Gmail you can attach a file up to 25 MB, if more, it will automatically upload it to Google Drive and show it as a link.
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