{"id":3840,"date":"2018-10-11T17:15:24","date_gmt":"2018-10-11T14:15:24","guid":{"rendered":"https:\/\/www.systemcodegeeks.com\/?p=3840"},"modified":"2018-10-11T14:11:08","modified_gmt":"2018-10-11T11:11:08","slug":"macos-dovecot-setgroups-failed","status":"publish","type":"post","link":"https:\/\/www.systemcodegeeks.com\/mac-os\/macos-dovecot-setgroups-failed\/","title":{"rendered":"Solution for: &#8220;macOS, Dovecot and setgroups() failed: Too many extra groups&#8221;"},"content":{"rendered":"<p>I upgraded my home server to macOS 10.14 after the upgrade on my laptop went very smooth. Also here the upgrade went smooth, but in the evening I discovered that I did not get any new email.<\/p>\n<p>I started investigating. First I saw that <a href=\"http:\/\/dovecot.org\/\">Dovecot<\/a> did not correctly start because an very old pid file said it has pid 104 and indeed there was a process wit pid 104, so dovecot though that is itself and stopped.<\/p>\n<p>After removing the pid file and restarting Dovecot, it started again and correctly listened on port 993 (imaps). But the imap client still could not login.<\/p>\n<p>Dovecot.log showed a lot of messages<\/p>\n<pre class=\"brush:php\">Oct 11 08:10:27 imap(hwr)&lt;12659&gt;: Fatal: setgroups(501) failed: Too many extra groups<\/pre>\n<p>Reading the manpage for <code>setgroups()<\/code> revealed that this call fails when more than <code>NGROUP_MAX<\/code> (=16) groups are passed. And indeed the user has more than 16 groups:<\/p>\n<pre class=\"brush:php\">$ id -G hwr\r\n20 6 12 61 80 98 500 701 702 30 33 100 204 250 395 103 104<\/pre>\n<p>Looking at them shows a lot of groups that macOS creates and assigns internally and which one can&#8217;t (easily) delete<\/p>\n<pre class=\"brush:php; wrap-lines:false\">$ id hwr\r\n...\r\n701(com.apple.sharepoint.group.1),702(com.apple.sharepoint.group.2),30(_keytabusers),33(_appstore),100(_lpoperator),204(_developer),250(_analyticsusers),395(com.apple.access_ftp),103(com.apple.access_screensharing-disabled),104(com.apple.access_ssh-disabled)<\/pre>\n<p>I <a href=\"https:\/\/dovecot.org\/pipermail\/dovecot\/2018-October\/113218.html\">wrote to the dovecot mailing list<\/a> and after an email exchange it turned out that there is a config option already present that can help here to reduce the number of groups passed to <code>setgroups()<\/code>.<\/p>\n<p>So the solution for me is to <code>last_valid_gid = 100<\/code> in <code>\/usr\/local\/etc\/dovecot\/conf.d\/10-mail.conf<\/code> and restart Dovecot.<\/p>\n<p>And now it is again humming along nicely \ud83d\ude42<\/p>\n<div class=\"attribution\">\n<table>\n<tbody>\n<tr>\n<td>Published on System Code Geeks with permission by Heiko Rupp, partner at our <a href=\"\/\/www.systemcodegeeks.com\/join-us\/scg\/\" target=\"_blank\" rel=\"noopener\">SCG program<\/a>. See the original article here: <a href=\"http:\/\/pilhuhn.blogspot.com\/2018\/10\/solution-for-dovecot-and-setgroups.html\" target=\"_blank\" rel=\"noopener\">Solution for: &#8220;macOS, Dovecot and setgroups() failed: Too many extra groups&#8221;<\/a><\/p>\n<p>Opinions expressed by System Code Geeks contributors are their own.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>I upgraded my home server to macOS 10.14 after the upgrade on my laptop went very smooth. Also here the upgrade went smooth, but in the evening I discovered that I did not get any new email. I started investigating. First I saw that Dovecot did not correctly start because an very old pid file &hellip;<\/p>\n","protected":false},"author":3076,"featured_media":193,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[],"class_list":["post-3840","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mac-os"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Solution for: &quot;macOS, Dovecot and setgroups() failed: Too many extra groups&quot; - System Code Geeks - 2026<\/title>\n<meta name=\"description\" content=\"Interested to learn about macOS? Check our article explaining how the amount of groups can cause faulure to macOS, Dovecot and setgroups().\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.systemcodegeeks.com\/mac-os\/macos-dovecot-setgroups-failed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Solution for: &quot;macOS, Dovecot and setgroups() failed: Too many extra groups&quot; - System Code Geeks - 2026\" \/>\n<meta property=\"og:description\" content=\"Interested to learn about macOS? 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