R=localuser T=local_delivery Defer (-52): Retry Time N$

I've seen a lot of these messages in my exim main log:

R=localuser T=local_delivery defer (-52): Retry time n$

I do not know why. I can however still send/receive mail but I want to make sure there is no valid mails being filtered out or such.

I've done:

/scripts/mailperm
/scripts/eximup --force

My domains are in:

/etc/localdomains
/etc/remotedomains does not exist

WHM > EXIM config I only have this checked on:

Verify the existence of email senders.

EXIM config file:

Code:
untrusted_set_sender = *
local_from_check = false
#local_sender_retain = true

timeout_frozen_after = 2d
ignore_bounce_errors_after = 12h

domainlist rbl_blacklist = lsearch;/etc/rblblacklist
domainlist rbl_bypass = lsearch;/etc/rblbypass
hostlist rbl_whitelist = lsearch;/etc/relayhosts : partial-lsearch;/etc/rblwhitelist
message_size_limit = 20M
#log_selector = +arguments +subject
log_selector = +all

#!!# ACL that is used after the RCPT command
check_recipient:
# Exim 3 had no checking on -bs messages, so for compatibility
# we accept if the source is local SMTP (i.e. not over TCP/IP).
# We do this by testing for an empty sending host field.
accept hosts = :

# Accept bounces to lists even if callbacks or other checks would fail
warn message = X-WhitelistedRCPT-nohdrfromcallback: Yes
condition =
${if and {{match{$local_part}{(.*)-bounces+.*}}
{exists {/usr/local/cpanel/3rdparty/mailman/lists/${lc:$1}/config.pck}}}
{yes}{no}}

accept condition =
${if and {{match{$local_part}{(.*)-bounces+.*}}
{exists {/usr/local/cpanel/3rdparty/mailman/lists/${lc:$1}/config.pck}}}
{yes}{no}}

# Accept bounces to lists even if callbacks or other checks would fail
warn message = X-WhitelistedRCPT-nohdrfromcallback: Yes
condition =
${if and {{match{$local_part}{(.*)-bounces+.*}}
{exists {/usr/local/cpanel/3rdparty/mailman/lists/${lc:$1}_${lc:$domain}/config.pck}}}
{yes}{no}}

accept condition =
${if and {{match{$local_part}{(.*)-bounces+.*}}
{exists {/usr/local/cpanel/3rdparty/mailman/lists/${lc:$1}_${lc:$domain}/config.pck}}}
{yes}{no}}

#if it gets here it isn't mailman

#sender verifications are required for all messages that are not sent to lists

accept domains = +local_domains
endpass

#recipient verifications are required for all messages that are not sent to the local machine
#this was done at multiple users requests

message = "The recipient cannot be verified. Please check all recipients of this message to verify they are valid."
verify = recipient

accept domains = +relay_domains

warn message = ${perl{popbeforesmtpwarn}{$sender_host_name}}
hosts = +relay_hosts
accept hosts = +relay_hosts

warn message = ${perl{popbeforesmtpwarn}{$sender_host_address}}
condition = ${perl{checkrelayhost}{$sender_host_address}}
accept condition = ${perl{checkrelayhost}{$sender_host_address}}

accept hosts = +auth_relay_hosts
endpass
message = $sender_fullhost is currently not permitted to
relay through this server. Perhaps you
have not logged into the pop/imap server in the
last 30 minutes or do not have SMTP Authentication turned on in your email client.
authenticated = *

deny message = $sender_fullhost is currently not permitted to
relay through this server. Perhaps you
have not logged into the pop/imap server in the
last 30 minutes or do not have SMTP Authentication turned on in your email client.

#!!# ACL that is used after the DATA command
check_message:
# Enabling this will make the server non-rfc compliant
# require verify = header_sender
accept

nobody@lsearch;/etc/localdomains "${if !eq {$header_From:}{}{$header_sender:$header_From:}fai l}" Fs
That's just a copy/paste from whm exim fields.

dnsreport shows no errors for my domains either

What could be the cause of this error? Is it local or remote (out of my control)?