Hi there, Using Postfix 3.5.6, only one IP per postfix instance, I have an issue with a specific Mailbox Provider limiting to 3 ingoing connections per IP.
Here is my setup for this Mailbox Provider for outgoing connections to this provider : In master.cf : *# ==========================================================================# service type private unpriv chroot wakeup maxproc command + args# (yes) (yes) (yes) (never) (100)# ==========================================================================transport unix - - y - 3 smtp* In main.cf : *# Transport policytransport_initial_destination_concurrency = 1transport_destination_concurrency_limit = 3transport_destination_rate_delay = 0transport_destination_recipient_limit = 2* Also, in main.cf, I have these settings : *smtp_connection_cache_on_demand = yessmtp_tls_connection_reuse = yessmtp_connection_reuse_time_limit = 300ssmtp_connection_reuse_count_limit = 99smtp_connection_cache_time_limit = 2s* I am receiving a lot of deferred messages from this Mailbox Provider : *Too many connections from your IP*... This kind of deferred message is happening when postfix is closing a connection and reopening a new one. It seems that my delay to close the connection and open a new one is much more shorter than the Mailbox Provider to see that the connection has been closed, so he sees 4 connections and starts deferring messages. Is there a way to implement a delay between connection closing and reopening for a specific transport in Postfix, while still using connection reuse ? Regards, -- Yves-Marie LE PORS-CHAUVEL Email Product Manager *T: +33 2 23 45 57 99* (3043) 23, rue du Bignon - 35 135 Chantepie www.ccmbenchmark.com