Is there a mail server limit that it just rejects e-mails

We have a lot of people e-mailing at once today. Probably more than I have ever seen. I was watching the queue and it was delivering a lot of messages at once. My question is a few people in cluding myself started to see something weird. My mail client in OSX came up with the password box saying it couldn't authenticate me out of the blue. It has never done that before and I'm on IMAP to the server. Then another person said they got a message from the server saying that there is no mailbox for this user on the system when there actually is and they have been receiving mail for a while. But out of the blue this starts happening when it seemed like the queue had a lot in it. It eventually delivered everything in the queue and now everything seems to be a peace again.
I just need to know if there is some limit on the mail system that tells it to reject stuff at a cetain point, or is there a way to turn off any limits so that it doesn't do this at all? Our server is a high end Intel xServer and shouldn't have a problem dealing with this. We also have an OC 192 connection to the internet, so I know that's not the issue either. Just wondering if anyone else knows what I'm talking about or how to fix it if this is an issue.

Right now I have 130 users in the system doing mail. I'm about to ad another 50 or more. So anywhere from 200 - 250 users total. As for the logs I'm not sure how to go back that far yesterday to see what was happening. All I know is everyone wasn't able to send mail or get mail for a moment and then it slowly cleared up. I think it's around that time I saw all those messages in the mail queue being delivered. Here is the output of Postconf -n:
command_directory = /usr/sbin
config_directory = /etc/postfix
content_filter = smtp-amavis:[127.0.0.1]:10024
daemon_directory = /usr/libexec/postfix
debugpeerlevel = 2
enableserveroptions = yes
html_directory = no
inet_interfaces = all
localrecipientmaps =
luser_relay = postmaster
mail_owner = _postfix
mailboxsizelimit = 0
mailbox_transport = cyrus
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
mapsrbldomains =
messagesizelimit = 10485760
mydestination = $myhostname,localhost.$mydomain,localhost,xpmedia.com
mydomain = xpmedia.com
mydomain_fallback = localhost
myhostname = mail.xpmedia.com
mynetworks = 98.173.129.235,127.0.0.0,127.0.0.1
newaliases_path = /usr/bin/newaliases
queue_directory = /private/var/spool/postfix
readme_directory = /usr/share/doc/postfix
relayhost =
sample_directory = /usr/share/doc/postfix/examples
sendmail_path = /usr/sbin/sendmail
setgid_group = _postdrop
smtpdclientrestrictions = permit_mynetworks rejectrblclient zen.spamhaus.org permit
smtpdpw_server_securityoptions = login,cram-md5,plain
smtpdrecipientrestrictions = permitsasl_authenticated,permit_mynetworks,reject_unauthdestination,permit
smtpdsasl_authenable = yes
smtpduse_pwserver = yes
unknownlocal_recipient_rejectcode = 550
virtualaliasdomains = hash:/etc/postfix/virtual_domains
virtualaliasmaps = hash:/etc/postfix/virtual
virtualmailboxdomains = hash:/etc/postfix/virtualdomainsxp
virtual_transport = lmtp:unix:/var/imap/socket/lmtp

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