diff --git a/imap-send.c b/imap-send.c
index 0b9c464..171c887 100644
--- a/imap-send.c
+++ b/imap-send.c
@@ -30,6 +30,7 @@
 #else
 #include <openssl/evp.h>
 #include <openssl/hmac.h>
+#include <openssl/x509v3.h>
 #endif
 
 struct store_conf {
@@ -292,6 +293,24 @@
 	int len;
 	X509_NAME *subj;
 	char cname[1000];
+	int i, found;
+	STACK_OF(GENERAL_NAME) *subj_alt_names;
+
+	/* try the DNS subjectAltNames */
+	found = 0;
+	if ((subj_alt_names = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL))) {
+		int num_subj_alt_names = sk_GENERAL_NAME_num(subj_alt_names);
+		for (i = 0; !found && i < num_subj_alt_names; i++) {
+			GENERAL_NAME *subj_alt_name = sk_GENERAL_NAME_value(subj_alt_names, i);
+			if (subj_alt_name->type == GEN_DNS &&
+			    strlen((const char *)subj_alt_name->d.ia5->data) == (size_t)subj_alt_name->d.ia5->length &&
+			    host_matches(hostname, (const char *)(subj_alt_name->d.ia5->data)))
+				found = 1;
+		}
+		sk_GENERAL_NAME_pop_free(subj_alt_names, GENERAL_NAME_free);
+	}
+	if (found)
+		return 0;
 
 	/* try the common name */
 	if (!(subj = X509_get_subject_name(cert)))