error451

there are currently too many connections from your ip/block please try again later

Beberapa hari terakhir saya mendapati error log di email server, dan ini hanya terjadi pada email beberapa domain. Error log nya adalah seperti berikut:

May  3 08:56:54 mail postfix/smtp[11373]: 6623CB00001: to=<[email protected]>, relay=mail.abc.co.id[116.1.2.10]:25, delay=0.71, delays=0.01/0.01/0.69/0, dsn=4.0.0, status=deferred (host mail.abc.co.id[116.1.2.10] refused to talk to me: 451 TOO_MANY_CONNECTIONS(451) – There are currently too many connections from your IP/IP block. Please try again later.)
May  3 08:56:54 mail postfix/smtp[11373]: 6623CB00001: to=<[email protected]>, relay=mail.abc.co.id[116.1.2.10]:25, delay=0.71, delays=0.01/0.01/0.69/0, dsn=4.0.0, status=deferred (host mail.abc.co.id[116.1.2.10] refused to talk to me: 451 TOO_MANY_CONNECTIONS(451) – There are currently too many connections from your IP/IP block. Please try again later.)
May  3 08:56:54 mail postfix/smtp[11373]: 6623CB00001: to=<[email protected]>, relay=mail.abc.co.id[116.1.2.10]:25, delay=0.71, delays=0.01/0.01/0.69/0, dsn=4.0.0, status=deferred (host mail.abc.co.id[116.1.2.10] refused to talk to me: 451 TOO_MANY_CONNECTIONS(451) – There are currently too many connections from your IP/IP block. Please try again later.)

Error 451 (too_many_connections) disebabkan oleh maximum connections limit di MTA engine penerima dimana koneksi dari suatu host dibatasi cukup kecil. Dan solusi satu-satunya adalah menghungi email administrator atau postmaster dari server tersebut agar menaikan limitnya.

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