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diff -uprN nail/sendout.c nail-patched/sendout.c
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--- nail/sendout.c 2015-07-16 14:15:22.864905226 +0200
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+++ nail-patched/sendout.c 2015-07-17 09:41:06.778677181 +0200
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@@ -966,6 +966,19 @@ mail1(struct header *hp, int printheader
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return STOP;
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}
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#endif
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+
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+ /*
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+ * Variable "from" is set but empty, let user know
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+ * that something is wrong.
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+ */
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+ if ((cp = value("from")) != NULL && !*cp) {
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+ fprintf(stderr, "From address is empty. ");
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+ fprintf(stderr, "Check your mail config ");
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+ fprintf(stderr, "file for typos. E.g. no ");
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+ fprintf(stderr, "whitespace after set from=");
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+ fprintf(stderr, "\n");
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+ }
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+
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if ((cp = value("autocc")) != NULL && *cp)
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hp->h_cc = cat(hp->h_cc, checkaddrs(sextract(cp, GCC|GFULL)));
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if ((cp = value("autobcc")) != NULL && *cp)
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diff -uprN nail/smtp.c nail-patched/smtp.c
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--- nail/smtp.c 2015-07-16 14:15:17.626914449 +0200
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+++ nail-patched/smtp.c 2015-07-17 09:17:43.412730513 +0200
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@@ -135,7 +135,7 @@ myaddrs(struct header *hp)
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if (hp->h_from->n_name)
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return savestr(hp->h_from->n_name);
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}
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- if ((cp = value("from")) != NULL)
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+ if ((cp = value("from")) != NULL && *cp)
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return cp;
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/*
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* When invoking sendmail directly, it's its task
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@@ -177,6 +177,9 @@ smtp_auth_var(const char *type, const ch
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char *var, *cp;
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int len;
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+ if (type == NULL || addr == NULL)
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+ return NULL;
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+
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var = ac_alloc(len = strlen(type) + strlen(addr) + 7);
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snprintf(var, len, "smtp-auth%s-%s", type, addr);
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if ((cp = value(var)) != NULL)
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