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Allow more than 4K recipients in single SMTP mail

Currently when too many recipients are present in single SMTP mail (like more than 3K), then server cannot store that mail due to recipient limit exceeded and it gives the error on server console as "SMTP Server: Insufficient memory".

This is due to hard limit set on recipients field size and cannot be exceeded.

So the only option is to send the mail in batches with lower number of recipients.

So there is a feature request to increase this field limit to allow more than 4K recipients in SMTP mail.

  • Guest
  • Feb 7 2020
  • Unlikely to implement
  • Attach files
  • Admin
    Thomas Hampel commented
    10 Feb, 2020 09:08am

    Unlikely to implement.
    Other vendors have a much lower limit of recipients per mail, e.g.
    Google : 100 (client) / 500 (online)
    Microsoft (online) : 500
    Thunderbird (client): 60