<!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body><div data-crea="font-wrapper" style="font-family: Tahoma; font-size: 16px"><br>Hi , <div></div><div><br></div><div>Please suggest , for faster delivery what could be the best config in postfix + cyrus-imapd . <br></div><div><br></div><div>I am using the cyrus-imapd-2.4.17-6.el6.x86_64 for mailbox server and for smtp server postfix-2.10.0-1.el6.x86_64</div><div> Both server have SAS hdd , 16 core , 16 GB RAM . There is no i/o issues<br></div><div><br></div><div>Mailbox server have 21K email ids. Cyrus running with tcp socket on port 24 i.e lmtpd . cyrus singleinstance is maintained</div><div>For group id mapping is under virtual_alias_maps of smtp's main.cf i.e no /etc/aliases. From smtp server emails are getting deliver by transport_maps to mailbox server .</div><div><br></div><div>My problem observe :-- </div><div>--------------------------</div><div>1) When HOD send email to 3-5 big group email ids then , then its postfix delivery get slow. What I observe is postfix getting delivered the traffic per email and not parallel. Each group contain 3k or 7k email ids. </div><div><br></div><div>In peak hours the queue on postfix get high and other normal emails also getting stuck in queue. Once the group email get clear after that other emails also get clear. </div><div><br></div><div>With the help previous post and google I have made few changes as follows , I current config as follows </div><div><br></div><div>in mailbox cyrus.conf :-- lmtp cmd="lmtpd -a" listen="lmtp" prefork=0<br></div><div><br></div><div>in main.cf of smtp server :--</div><div>lmtp_destination_concurrency_limit = 100</div><div>lmtp_destination_recipient_limit = 0</div><div><br></div><div>Kindly suggest whether its correct or any other changes require. <br></div><div><br></div><div>Regards</div><div>Jayesh Shinde</div><div><br></div></div></body></html>