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Emails not going through, ExplicitlyDiscarded, HADISCARD

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Hi,

We got an application sending out emails internally to our end users, it does so in bulks of about 50 or so. The application sends via a Exchange 2013 receive connector where the application server is listed as an allowed relay.

About 30% of the emails go through fine, but most are dropped in Exchange as such:

TimestampSourceContextSourceEventId

2/04/2015 13:02ExplicitlyDiscardedSMTPHADISCARD

Its different recipients that get dropped every time and no other issues sending to any of these users.



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