那个电子邮件确实是无效的,至少这是PHP开发人员所理解的.来源提供此通知：

/*
 * The regex below is based on a regex by Michael Rushton.
 * However,it is not identical.  I changed it to only consider routeable
 * addresses as valid.  Michael's regex considers a@b a valid address
 * which conflicts with section 2.3.5 of RFC 5321 which states that:
 *
 *   Only resolvable,fully-qualified domain names (FQDNs) are permitted
 *   when domain names are used in SMTP.  In other words,names that can
 *   be resolved to MX RRs or address (i.e.,A or AAAA) RRs (as discussed
 *   in Section 5) are permitted,as are CNAME RRs whose targets can be
 *   resolved,in turn,to MX or address RRs.  Local nicknames or
 *   unqualified names MUST NOT be used.

changelog提到了这个针对PHP 5.3.3和PHP 5.2.14的错误修复.