"deadline shrunk" in logs ?

[J Doe]

Hi list,

Sometimes when I am checking my e-mail server logs, SA will note
"deadline shrunk":

    May 27 12:56:07 server spamd[29305]: async: aborting after 4.253 s,
        deadline shrunk: DNSBL, A/106.55.47.104.dnsbl.sorbs.net, rules:
        RCVD_IN_SORBS_DUL, __RCVD_IN_SORBS

What does the expression "deadline shrunk" mean ?

Thanks,

- J