KNOWNBUGS revision 38032
1 2 3 K N O W N B U G S I N S E N D M A I L 4 (for 8.9.0) 5 6 7The following are bugs or deficiencies in sendmail that I am aware of 8but which have not been fixed in the current release. You probably 9want to get the most up to date version of this from ftp.sendmail.org 10in /pub/sendmail/KNOWNBUGS. For descriptions of bugs that have been 11fixed, see the file RELEASE_NOTES (in the root directory of the sendmail 12distribution). 13 14This list is not guaranteed to be complete. 15 16 17* Null bytes are not handled properly in headers. 18 19 Sendmail should handle full binary data. As it stands, it handles 20 all values in the body, but only 0x01-0x80 and 0xA0-0xFF in 21 the header. Notably missing is 0x00, which would require a major 22 restructuring of the code -- for example, almost no C library support 23 could be used to handle strings. 24 25* Duplicate error messages. 26 27 Sometimes identical, duplicate error messages can be generated. As 28 near as I can tell, this is rare and relatively innocuous. 29 30* $c (hop count) macro improperly set. 31 32 The $c macro is supposed to contain the current hop count, for use 33 when calling a mailer. This macro is initialized too early, and 34 is always zero (or the value of the -c command line flag, if any). 35 This macro will probably be removed entirely in a future release; 36 I don't believe there are any mailers left that require it. 37 38* If you EXPN a list or user that has a program mailer, the output of 39 EXPN will include ``@local.host.name''. You can't actually mail to 40 this address. It's not clear what the right behavior is in this 41 circumstance. 42 43* \231 considered harmful. 44 45 Header addresses that have the \231 character (and possibly others 46 in the range \201 - \237) behave in odd and usually unexpected ways. 47 48* accept() problem on SVR4. 49 50 Apparently, the sendmail daemon loop (doing accept()s on the network) 51 can get into a weird state on SVR4; it starts logging ``SYSERR: 52 getrequests: accept: Protocol Error''. The workaround is to kill 53 and restart the sendmail daemon. We don't have an SVR4 system at 54 Berkeley that carries more than token mail load, so I can't validate 55 this. It is likely to be a glitch in the sockets emulation, since 56 "Protocol Error" is not possible error code with Berkeley TCP/IP. 57 58 I've also had someone report the message ``sendmail: accept: 59 SIOCGPGRP failed errno 22'' on an SVR4 system. This message is 60 not in the sendmail source code, so I assume it is also a bug 61 in the sockets emulation. (Errno 22 is EINVAL "Invalid Argument" 62 on all the systems I have available, including Solaris 2.x.) 63 Apparently, this problem is due to linking -lc before -lsocket; 64 if you are having this problem, check your Makefile. 65 66* accept() problem on Linux. 67 68 Apparently, the accept() in sendmail daemon loop can return ETIMEDOUT 69 and cause sendmail to sleep for 5 seconds during which time no new 70 connections will be accepted. An error is reported to syslog: 71 72 Jun 9 17:14:12 hostname sendmail[207]: NOQUEUE: SYSERR(root): 73 getrequests: accept: Connection timed out 74 75 "Connection timed out" is not documented as a valid return from 76 accept(2) and this was believed to be a bug in the Linux kernel. 77 Later information from the Linux kernel group states that Linux 78 2.0 kernels follow RFC1122 while sendmail follows the original BSD 79 (now POSIX 1003.1g draft) specification. The 2.1.X and later kernels 80 will follow the POSIX draft. 81 82* Excessive mailing list nesting can run out of file descriptors. 83 84 If you have a mailing list that includes lots of other mailing 85 lists, each of which has a separate owner, you can run out of 86 file descriptors. Each mailing list with a separate owner uses 87 one open file descriptor (prior to 8.6.6 it was three open 88 file descriptors per list). This is particularly egregious if 89 you have your connection cache set to be large. 90 91* Connection caching breaks if you pass the port number as an argument. 92 93 If you have a definition such as: 94 95 Mport, P=[IPC], F=kmDFMuX, S=11/31, R=21, 96 M=2100000, T=DNS/RFC822/SMTP, 97 A=IPC [127.0.0.1] $h 98 99 (i.e., where $h is the port number instead of the host name) the 100 connection caching code will break because it won't notice that 101 two messages addressed to different ports should use different 102 connections. 103 104* ESMTP SIZE underestimates the size of a message 105 106 Sendmail makes no allowance for headers that it adds, nor does it 107 account for the SMTP on-the-wire \r\n expansion. It probably doesn't 108 allow for 8->7 bit MIME conversions either. 109 110* Paths to programs being executed and the mode of program files are 111 not checked. Essentially, the RunProgramInUnsafeDirPath and 112 RunWritableProgram bits in the DontBlameSendmail option are always 113 set. This is not a problem if your system is well managed (that is, 114 if binaries and system directories are mode 755 instead of something 115 foolish like 777). 116 117* 8-bit data in GECOS field 118 119 If the GECOS (personal name) information in the passwd file contains 120 8-bit characters, those characters can be included in the message 121 header, which can cause problems when sending SMTP to hosts that 122 only accept 7-bit characters. 123 124* 8->7 bit MIME conversion 125 126 When sendmail is doing 8->7 bit MIME conversions, and the message 127 contains certain MIME body types that cannot be converted to 7-bit, 128 sendmail will strip the message to 7-bit. 129 130* 7->8 bit MIME conversion 131 132 If a message that is encoded as 7-bit MIME is converted to 8-bit and 133 that message when decoded is illegal (e.g., because of long lines or 134 illegal characters), sendmail can produce an illegal message. 135 136* MIME encoded full name phrases in the From: header 137 138 If a full name phrase includes characters from MustQuoteChars, sendmail 139 will quote the entire full name phrase. If MustQuoteChars includes 140 characters which are not special characters according to STD 11 (RFC 141 822), this quotation can interfere with MIME encoded full name phrases. 142 By default, sendmail includes the single quote character (') in 143 MustQuoteChars even though it is not listed as a special character in 144 STD 11. 145 146 147(Version 8.32, last updated 6/30/98) 148