10 INBOX.LV SMTP Inbox Office365 Gmail & All Domain
How to avoid SMTP lockout
Do not exceed the above limits (especially 15 emails per hour and 5 emails per minute if using SMTP). Do not send mass mail to purchased/rented/scraped lists, or to people who have not given consent (opt-in). inbox.lv clearly prohibits this and will lock the account if spam/abuse is detected.
help.inbox.lv Avoid continuous, steady high-speed sending → the anti-spam system will flag it. If you use multiple accounts at the same time from the same IP or with similar behavior, it is easy to be detected and locked in bulk