we are setting up a mail service which will send emails periodically.

There are two kinds of email.

One which is sent three times a day (8, 13, 17 o'clock). Another which MAY be sent at 8am depending on some criterion) So there is the potential for 2 emails to be send at 8am.

I am worried about a user receiving two emails from the same address at the exact same time being marked potentially as spam by the email provider (I'm not concerned about the user marking it as spam - they asked for these emails).

Since we will be using our company mail server, if it gets blacklisted by IP or email address we could be in a lot of trouble.

If anyone could shed some light on this that would be great - I couldn't find anything at all on the topic online. My question is quite simply, How likely is it that we have any kind of trouble doing this? (Spam going to their spam box or worse trouble, getting blacklisted)


  • Do you have any valid reason why the mails should be marked as spam (other than time)? Don't you think there are many mails floating around which are delivered at the same time? – Lenniey Mar 27 '17 at 7:12
  • From the same address no, I couldn't think of anything. Can you? – Worthy7 Mar 27 '17 at 7:15
  • No...not at all – Lenniey Mar 27 '17 at 7:16
  • I just checked my own personal mail and even spam from Amazon has an hour delay or so. A few other newsletters I received on the same day were also staggered. – Worthy7 Mar 27 '17 at 7:19
  • Wait. What is your question? That if your mails are sent at exactly the same time they'll be regarded as spam, or that if they're regarded as spam that they'll be delivered too late? – Lenniey Mar 27 '17 at 7:24

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