Dolphin 6.1 Open Hole for hacks! Important ?

Hello after setting up that script iam found out that this version 6.1 also latest downloadable have a bug open for not logget guest (etc hackers)

after looking and configure my mailserver i found not delivered greeting mails from non page members im take a look why i recive it ? maybe my mailsserver make problems, hmm but how and why ? so i checked logs and saw that
a search engine bot or robot after spidering my site send this

pls confirm and help i dont like unstable software .

thx

You can disable the ability for guests to send them in:

admin/settings/membership levels/non member/send greetings

admin/memb_levels.php?edit=actions&edit_level=1

delete send greeting

was an good ide but is disabled :/

ok that setting is off...stop bot with robots.txt