Mais du coup, dans ton main.cf, tu présentes ça comment ?
juste avec la ligne
transport_maps = hash:/etc/postfix/transport
sans rien d’autre ?
Bon, ceci dit, j’ai fait la même conf que toi et le résultat dans la log ne me parait pas logique. J’ai envoyé à la file 5 mails au même destinataire chez orange :
Nov 19 20:29:17 mail postfix-slow/smtp[10766]: Trusted TLS connection established to smtp-in.orange.fr[193.252.22.65]:25: TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)
Nov 19 20:29:17 mail postfix-slow/smtp[10766]: 0255061F6C: to=<toto@orange.fr>, relay=smtp-in.orange.fr[193.252.22.65]:25, delay=2.2, delays=1.8/0.01/0.2/0.18, dsn=2.0.0, status=sent (250 2.0.0 TvVH2100h4js4Zv01vVHHt mail accepted for delivery)
Nov 19 20:29:22 mail postfix-slow/smtp[10766]: Trusted TLS connection established to smtp-in.orange.fr[193.252.22.65]:25: TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)
Nov 19 20:29:23 mail postfix-slow/smtp[10766]: 7331261F6C: to=<toto@orange.fr>, relay=smtp-in.orange.fr[193.252.22.65]:25, delay=2.6, delays=0.28/2/0.24/0.1, dsn=2.0.0, status=sent (250 2.0.0 TvVN2101b4js4Zv01vVNMA mail accepted for delivery)
Nov 19 20:29:28 mail postfix-slow/smtp[10766]: Trusted TLS connection established to smtp-in.orange.fr[193.252.22.65]:25: TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)
Nov 19 20:29:28 mail postfix-slow/smtp[10766]: C4FC861F6C: to=<toto@orange.fr>, relay=smtp-in.orange.fr[193.252.22.65]:25, delay=1.7, delays=0.38/1/0.17/0.11, dsn=2.0.0, status=sent (250 2.0.0 TvVU2100K4js4Zv01vVUQC mail accepted for delivery)
Nov 19 20:29:41 mail postfix-slow/smtp[10766]: Trusted TLS connection established to smtp-in.orange.fr[80.12.242.9]:25: TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)
Nov 19 20:29:41 mail postfix-slow/smtp[10766]: AEAB661F6C: to=<toto@orange.fr>, relay=smtp-in.orange.fr[80.12.242.9]:25, delay=0.67, delays=0.44/0/0.14/0.09, dsn=2.0.0, status=sent (250 2.0.0 TvVh2100B4js4Zv01vVhYD mail accepted for delivery)
Nov 19 20:29:47 mail postfix-slow/smtp[10766]: Trusted TLS connection established to smtp-in.orange.fr[193.252.22.65]:25: TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)
Nov 19 20:29:47 mail postfix-slow/smtp[10766]: 52A7A61F6C: to=<toto@orange.fr>, relay=smtp-in.orange.fr[193.252.22.65]:25, delay=0.67, delays=0.43/0/0.13/0.1, dsn=2.0.0, status=sent (250 2.0.0 TvVn2100p4js4Zv01vVnby mail accepted for delivery)
D’après moi, il y aurait dû y avoir au 3eme mail un délais de 10 sec pour envoyer le 4eme, alors que quand on regarde la valeur delay, ça a pris moins d’une seconde.
Ou alors j’ai mal compris le sens des variables smtp_destination_concurrency_limit et slow_destination_rate_delay