Linux sendmail vs postfix : stability, robustness & vulnerabilities
We are using a commercial version of sendmail (refer to sendmail.com) in RHEL 5.x
We have seen something like 20k email sent to it within 5 mins & it just hung up or caused
severe delay in delivery.
Is postfix (which is now the default Smtp with RHEL 6.x) more robust ie can take bursts of high
volumes & can handle huge attachments/mails with faster deliveries?
In the past VA scans 5-10years ago, sendmail is always reported as something that should
not be used. Does postfix has similar issue or it's not vulnerable to most VA scans today?
Was told by our vendor that they set up 'commercial' version of sendmail which has a
separate interface/module GUI for whitelisting & blacklisting. Is there a commercial
version of 'postfix' which we can get official (eg: supported by RHEL) support with
add-on user-friendly interfaces/GUI?