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Sendmail : Recipient address rejected: User unknown in local recipient table Launch your SSH client and SSH to your CentOS Server and login. Add the following to the main.cf by typing cd /etc/postfix postconf -e “local_transport = error:No local mail delivery” postconf -e “mydestination = ” postconf -e “relay_recipient_maps =” postconf -e “relay_domains = hash:/etc/postfix/relay_domains” vi relay_domains The “vi relay_domains” command open a new file named “relay_domains”. Add...

Starting from Ubuntu 9.10, Network Manager uses ModemManager to communicate with mobile broadband (CDMA, UMTS and others) cards. Ubuntu 9.10 uses version 0.2 of ModemManager which most probably has some bug because of which few modems don’t get recognized. ZTE AC2726, the modem which comes with PTCL EVDO, is one of the unfortunate ones. In a previous post we have covered how to connect to PTCL EVDO in Ubuntu 9.10. If you have Ubuntu 10.04 or later you can use the following procedure to connect to PTCL EVDO.   Install usb_modeswitch...

PTCL Evo connection comes with ZTE AC2726 USB modem. It’s really easy to use it on Windows and Mac as their drivers provided in the modem’s memory but to use it on Linux is a bit tricky. Recently I succeeded in installing and configuring it on Ubuntu 9.10 and below are the steps which worked for me. When you attach the modem to your Linux machine it gets detected as a usb storage device and not as a usb modem. To use it as usb modem we need to convert it from usb-storage device to usb serial device in ubuntu. To do this I...